The Library

Most commercial citrine is heat-treated amethyst. The chemistry, the visual cues, and why disclosure is the real question.

The stones routinely heated to deepen color, why it is usually accepted, and when it should be disclosed.

Aura stones are real quartz with a vapor-deposited metal coating. What that is, and what it means for value.

Oiling, glass filling, and fracture dyeing. The quiet treatments that often go unmentioned at the counter.

Color pooling in cracks, hues that are too uniform, and the other tells that a stone got its color from a bottle.

When smoky quartz forms in the ground, when it comes out of a lab, and what the name morion really means.

Hydrothermal quartz and synthetic gems. The tells that separate a grown crystal from a mined one.

Three pretty stones that are actually glass. Fine when it is disclosed, a problem when it is not.

The two real jades, the dyed quartz and glass sold as jade, and what the Type A, B, and C labels mean.

Telling true amber from young copal and plastic, with the salt-water, UV, and hot-point tests.

Stabilized, reconstituted, and block. How to tell genuine turquoise from the dyed and imitation stand-ins.

Lemurian, Super Seven, and friends. Which names are real geology and which are marketing stickers.

Real labradorescence comes from inside the feldspar and moves as you tilt it. How to tell true flash from coatings, foils, and man-made glass.

Six physical tests in order: color, luster, streak, hardness, habit, and heft. Two or three usually settle it, no app required.

Some invented names hide an ordinary mineral under a nickname. Others hide a piece of glass. How to tell which before you pay a premium.

Most fake clusters are glass, resin, or lab-grown quartz sold as natural. Five tells to check before you buy.

Misleading by name: it is dyed jasper, not turquoise, fine and durable as a bead stone if you know what you're buying.

The product itself is glass; the deception is the premium price and origin story, not the material.

It is a treatment by definition; sellers calling it a natural rainbow crystal are misrepresenting it.

It is a treatment by definition; the issue is sellers presenting it as naturally blue crystal.

This IS the fake: sold as rare 'blue obsidian from volcanic lakes' and similar stories.

Sold as 'diamond', 'white sapphire', or 'clear quartz points' (faceted), weight is the quick tell.

This IS the treatment: vivid slices, 'galaxy' geodes, and rainbow druzy are dyed; honest sellers disclose it.

This IS the treatment: assume vivid cheap red coral is dyed bamboo coral; undisclosed dye is the norm, and genuine precious coral carries ethical and legal restrictions.

This IS the treatment: neon tumbled 'quartz' with spider-web color is quench-crackled dye work, full stop.

This IS the simulant: 'cat's eye' beads in pink, blue, or green are fiber-optic glass essentially every time.

The premium lab product most often passed off as natural ruby, also watch for flux-grown crystal clusters glued onto matrix and sold at gem shows as mined specimens.

This IS the trick: closed-back settings hiding foil or paint turn glass into 'ruby' and pale stones into 'sapphire', never buy a sealed-back gem as fine jewelry without lab verification.

Honest under its own name; occasionally sold as 'rare agate' to the unwary, weight settles it instantly.

This IS the fake: 'natural glow-in-the-dark opal/moonstone' does not exist, hours-long afterglow means man-made phosphor every time.

This IS the treatment: the vast majority of retail 'citrine' clusters and points are baked amethyst, usually undisclosed.

Sold as natural emerald constantly, including 'raw crystal clusters' on matrix, certification matters at emerald prices.

This IS the fake: lightweight, warm-touch, perfectly striped 'malachite' beads and carvings are resin or glass, genuine stone is heavy, cool, and irregular.

This IS the treatment: undisclosed irradiation defines commercial blue topaz; 'natural deep blue topaz' claims deserve hard skepticism.

Broken boule chunks are widely sold as 'raw ruby/sapphire'; glass-filled composite rubies are common in bead strands.

Vivid blue/green 'quartz' gems and ultra-clean amethyst points are routinely lab-grown and sold as natural.

The issue is labeling: it impersonates aquamarine, sapphire, zircon, and more in budget jewelry.

This IS the impostor: most magnetic 'hematite' jewelry contains zero hematite.

Sold as diamond by the unscrupulous because it defeats basic testers, the loupe doubling check is your defense.

A treatment by definition: harmless when disclosed, but the coating is permanent-looking yet fragile, repolishing or rough wear strips it to plain colorless topaz.

The included 'crystals' are real but often lowest-grade chips; EMF claims are unsupported, buy it as art if you like it.

Routinely sold as natural whole amber, especially in large cheap beads, flow lines and squashed bubbles are the tells.

This IS the fake: oversized insect inclusions, bargain prices on big flawless beads, and chemical hot-needle smell all scream resin, the saltwater float test settles it in a minute.

Honest as a found object, but tumbled 'craft sea glass' floods the jewelry market, uniform frosting without crescent pits means a machine, not the sea.

Honest found object; 'tumbler-aged' craft shards exist for jewelry, uniform matte all over without genuine surf-softened glaze gloss.

Frequently sold as obsidian, andara crystals, or rare gems; bubbles and swirls reveal furnace origins.

This IS the fake: huge flawless 'quartz' or 'citrine' towers at bargain prices are the give-away combination.

This IS the fake: flawless golden towers and spheres with interior bubbles are tinted glass, cross-check Smelted Quartz and Heat-Treated Citrine for the full citrine deception map.

An honest, near-universal treatment rather than a fake, the sins are non-disclosure and the next steps down: dyed material, reconstituted chips, and pure block imitation.

This IS the simulant: routinely sold as Australian or Ethiopian opal, especially in inlay jewelry and bead strands; 'monarch' and 'aurora' opal with too-perfect webbing are lab products.

This IS the fake: most sub-$1-per-bead 'turquoise' is block resin or magnesite composite; painted-on uniform black webbing is the classic tell.

A treatment by definition; sold under many fanciful names ('flame aura', 'mystic'), same vapor-coated quartz.

A treatment by definition: fine when sold as 'titanium druzy', misleading when labeled rare 'rainbow crystal', the metallic rainbow never grew that way.

Dyed shell and printed plastic imitations circulate in cheap jewelry; natural nacre shows depth and varied color travel.

Composite 'dino bone' made of crushed fragments in resin exists, real gembone is cold, hard, and shows continuous cell webbing.

Nearly all jewelry ammolite is a stabilized doublet or triplet, standard practice, but 'solid natural' claims deserve a side-view; dyed abalone occasionally poses as it.

Cheap 'ammonites' can be resin casts; Moroccan ones sometimes have carved-in or painted detail.

Doublets and resin-backed pieces are sold as boulder opal, inspect the opal-matrix junction from the side.

The big issue is direction: copal with embedded modern insects is endlessly sold as 'amber with fossil inclusions', the alcohol test answers in seconds.

The trade's open secret: most polished rainbow 'dinosaur coprolite' is plain agatized rock with a fun story, genuine identifiable coprolites usually look like, well, what they are.

Red coral is widely dyed or imitated, and harvest is restricted, fossil/agatized coral is the ethical, common form in shops.

Honest and abundant; complete flower-like crowns are sometimes composited from parts, loupe the matrix joins on expensive plates.

Less faked than moldavite but green bottle glass appears under the name, frothy ropy texture and Tasmanian sourcing matter.

Orange glass and resin sell as fire opal online; genuine stone may also craze over years, ask sellers about stability.

Mostly honest; the perennial mix-up is dendrites sold (or bought) as 'fern fossils', anatomy under a loupe settles it in seconds.

Common honest fossils, but inpainting and 'improvement' are routine on cheap decor plates, buy specimen-grade from quarries or dealers who disclose restoration.

Cheap and abundant, so rarely faked, though Moroccan Otodus teeth are often re-glued onto invented custom matrix and 'restored' at the tips.

The mislabel IS the issue: 'green moonstone' is garnierite nearly every time, no glow, no moonstone.

Victorian-era 'French jet' (black glass) and modern resin imitations abound, weight and streak settle it.

Heavily faked with yellow glass as supply tightens, real LDG shows frosted skin, flow swirls, and cristobalite puffs, and is never bargain-cheap.

The catch-all rust: earthy yellow-brown iron crusts and masses with an ochre streak, nature's most common brown stain given a name.

Not faked; supply is limited since the source is an old iron-mining district, similar stromatolites from elsewhere are sold under other names.

Big money breeds restoration: composite teeth, rebuilt serrations, and painted repairs abound, ask for unretouched photos and UV-check glossy 'flawless' giants.

Composite plates with carved-in 'extra fossils' exist, chambers should align naturally, not look chiseled.

Nearly all pearls today are cultured (genuine); the fakes to dodge are coated glass and plastic, the tooth test rules quickly.

Resin replicas exist in tourist shops, real stones are cold, fizz in vinegar, and no two patterns repeat.

Indonesian palmwood is sometimes dyed for color pop; the dot/rod structure itself is nearly impossible to fake.

Honest material is abundant; ordinary banded jasper is sometimes upsold as 'stromatolite', look for domes and columns, not just stripes.

Molded glass 'tektites' are common in tourist markets; the matte pitted skin is the authenticity signature.

Morocco's fake-trilobite industry is legendary: resin casts, composites of real parts on carved matrix, and 'enhanced' carving, spectacular cheap specimens of rare species deserve hard.

Soft and water-sensitive, damage on cheap carvings is wear, not fakery; the name is also loosely applied to harder calcite.

Some 'lava beads' are dyed or are man-made ceramic; natural pores are irregular.

Rock made of visibly ANGULAR broken fragments cemented together, nature's rubble recompacted into stone.

Not faked; sold under many names (Miriam, elephant skin, cobra), all the same fossil hash stone.

Dull waxy rock that breaks in clean curved shells with knife-sharp edges and scratches glass, the all-purpose toolstone of prehistory.

Most 'meteorites' brought to experts are slag or magnetite, fusion crust, metal flecks, magnetism, and density together make the case; buy classified, documented stones.

Routinely enhanced: carving down the matrix to raise flowers is standard, fully painted fakes exist, inspect petals under magnification.

Sold online as 'dinosaur eggs' depressingly often, shell pores and bone texture are absent in concretions.

Dark waxy nodules wearing a white chalky rind, breaking in glassy curved shells sharp enough to shave, the legendary firestarter and toolstone.

Artificial fulgurites made with welders or downed power lines circulate widely, perfect long tubes at low prices warrant skepticism.

Vividly dyed Moroccan and Mexican geodes flood tourist markets; 'galaxy' and neon interiors are paint and dye jobs.

Speckled coarse rock of interlocking visible crystals, glassy gray quartz, blocky pink-white feldspar, and dark mica.

Machine-drilled pebbles are sold as hag stones online, folklore purists insist the hole (and the finding) must be nature's work.

Don't confuse with 'merlinite' (dendritic opal), two unrelated materials share the wizard branding.

'Kimberlite with diamond' tourist pieces often carry glued-in CZ or quartz, real in-matrix diamonds are museum material.

Pale kiwi-green stone speckled black and white like sesame seeds, actually a granitic rock of quartz, green amazonite, and black tourmaline, not a true jasper.

Soft gray-to-cream sedimentary stone that fizzes enthusiastically in vinegar and often carries visible shell fossils.

Frequently sold as 'onyx' when banded, a centuries-old trade habit; vinegar settles it.

Faked less than irons but misidentified often, XRF nickel confirmation and dealer classification papers are the standard.

'Meteor-wrongs' (slag, magnetite, hematite) dominate amateur finds; for purchases, stick to documented falls with classification.

Check sourcing, national-park collection is illegal; commercial stones come from private land.

Not faked; name occasionally misapplied to other red-yellow Australian jaspers.

Heavily faked at tourist sites and online, buy documented falls/finds from reputable dealers; slices should come with classification.

Granite gone giant, individual feldspar, quartz, and mica crystals measured in centimeters to meters, often hosting gem pockets.

Honest stone, dishonest name: it is marble, not jasper, so keep it away from acids and rough wear.

Black-and-white signature stone: rice- to pine-nut-shaped white magnesite grains scattered through dark graphite matrix like grains in pumpernickel.

Rock foam: pale, full of tiny bubbles, rough as sandpaper, and it floats on water.

Watch for dyed quartzite sold as jade, 'strawberry quartz', or 'emerald', color sits in grain boundaries.

Honest stone with a misleading trade name: it is rhyolite, not true jasper.

Patterned volcanic rock with angular patches, flow bands, or starburst orbs in mossy green-cream-tan palettes.

'Blue/gold sandstone' in bead shops is man-made goldstone glass, not sandstone.

Fine-grained gray rock that splits into flat ringing sheets along perfect parallel planes.

Many 'jade' or 'onyx' souvenirs are carved soapstone, the fingernail test answers instantly.

Unopened 'guaranteed crystal' eggs are a gamble by nature; some sellers glue polished agate slices onto plain halves, check the seam.

Triple-striped stone: golden tiger-eye silk, metallic gray hematite, and brick-red jasper in alternating bands, noticeably heavy.

Double trouble: the name implies turquoise it isn't, and the stone's popularity has spawned resin and dyed-magnesite copies, buy from Southwestern dealers who name the mine.

Rarely faked; tarnished lead scraps occasionally pose as it, lead is softer still and far less valuable to fake convincingly.

Grass-to-bottle-green bladed or needle-like crystals in radiating sprays, with the two diagonal amphibole cleavages.

Heavily faked: dyed crackle quartz and glass with green swirls are routinely sold as ajoite, check that color is sealed inside natural crystal.

Green glass and chrome diopside are sold as demantoid; horsetail inclusions are a badge of genuine Ural stones.

Tin-white brittle metal of serious heft that cleaves into stepped mirror plates rather than denting like true metals.

Heavy gray botryoidal masses with onion-skin layers that tarnish nearly black, fresh breaks briefly flash metallic then dull within days.

Silver-white wedge-shaped metallic crystals, brighter and whiter than pyrite, striated and notably heavy.

Brilliant deep-green slender prisms with an apple-green streak, born of copper meeting salty desert air.

Feather-soft pastel blue tufts and lacy sprays lining rusty cavities, so delicate a brush stroke can destroy them.

Not faked; the name is a flexible trade label for mottled multicolor jasper.

Not faked, the radioactivity is unprofitable to counterfeit; the real risk is buying it unlabeled in old collections.

Clove-brown crystals shaped like axe heads, flattened razor-edged wedges with strong brown/violet/straw color shifts as they turn.

A non-metallic mineral that feels shockingly heavy for its look, bladed or tabular crystals with pearly cleavage flashes.

Water-clear to white tabular pegmatite crystals that mimic quartz but cleave in flat mirror sheets quartz never shows.

Lab-grown red beryl and dyed stones circulate, provenance and certification matter at these prices.

Some 'black amethyst' is lab-irradiated quartz, genuine material flashes purple under strong light.

Most vivid blue agate on the market is dyed; check for color pooling in cracks and unnaturally even tone.

Dyed chalcedony floods the bead market; natural sky-blue material is muted and rarely uniform across large lots.

Rarely faked due to obscurity; beware dyed halite or fluorite cubes offered to beginners as boleite.

Chartreuse spear-point crystals with glassy faces, a yellow-green no common gem quite matches, softer than the beryls it resembles.

Brick-red jasper shattered and naturally re-glued, angular red fragments suspended in webs of gray, white, and black silica.

Emerald-green needle sprays and sparkling crusts in copper country, like malachite's glassier, non-fizzing cousin.

Dyed magnesite tumbles are sold as brucite; real brucite is notably softer and waxier.

Name gets borrowed for any brown orb jasper; true Bruneau has the porcelain finish and Idaho pedigree.

Mislabeling as rhodonite (and vice versa) is the main issue; color tone and locality are your guide.

Honest as a souvenir; the only sin is the name, faceted Cape May 'diamonds' in boardwalk jewelry are lovely quartz, nothing more.

Glossy brown-black crystals with diamond-bright faces and a heft that shocks, tin makes it nearly twice as dense as garnet.

Tiny glassy 'cubes' (actually slightly skewed rhombohedra) carpeting volcanic rock cavities, a zeolite that fakes being cubic.

This one runs backward: 'natural' labeled showpieces are almost always lab-grown copper sulfate sold at mineral prices.

Dark lead-gray heavy copper ore, soft enough to carve with a knife, that takes a sooty black tarnish, richest of the common copper sulfides.

Not faked; the childrenite-eosphorite series makes exact labels honest guesswork without analysis.

Black metallic-dull heavy ore with a BROWN streak and only weak magnetic response, the chrome-bearing twin of magnetite.

Synthetic color-change corundum has impersonated alexandrite for a century; fine cat's eye is also imitated by fiber-optic glass.

Epidote's pale low-iron sibling, grooved prismatic crystals in washed-out green, tan, or pink rather than epidote's loud pistachio.

Silver-white metallic crystals with a faint rosy blush, in striated cube-like forms, pyrite's shape wearing silver-pink instead of brass.

Rarely faked; mislabeling among look-alike white borates (ulexite, howlite) is the only common mix-up.

Black heavy tabular crystals from pegmatite country, denser than they look, dark-streaked, non-magnetic to weakly magnetic, the famous 'coltan' of electronics.

Argentine nodule agate with unusually saturated multicolor banding, crisp reds and oranges against smoky violets, often with druzy centers.

Electroformed/cast copper 'specimens' exist; organic branching and matrix attachment indicate the real thing.

White quartz and feldspar are sometimes mislabeled cryolite, the water test and softness sort it.

Deep garnet-red heavy mineral with near-metallic diamond luster and a shining red-brown streak, usually keeping company with green malachite.

Pale bottle-glass-green blocky crystals with many small faces, or, in Michigan form, opaque porcelain nodules in sherbet colors with copper flecks.

Not faked; mislabeled mottramite is the usual mix-up.

Simulants (CZ, moissanite, white sapphire) and lab-grown diamonds saturate the market, lab stones ARE diamond, so certification is the only practical separator.

Pearly cream-to-pink crystals with curved 'saddle' faces that fizz only weakly unless powdered or in warm acid.

Genuine Dryhead is limited and locality-specific; orange dyed Brazilian nodules are sometimes mislabeled with the name.

Brass filings and gilded lead pose as natural electrum in scam 'nugget' lots, density and softness expose them quickly.

Not faked; eudidymite/epididymite labels are often swapped in good faith.

Vivid magenta-crimson bladed sprays and crusts blooming on gray ore, the unmistakable pink signal of cobalt below.

High prices invite mislabeling: Mexican crazy lace and dyed agates get sold as 'Fairburns' online, pattern literacy and seller reputation matter.

Softly mottled jasper mixing sage green, mauve, and ochre in watercolor swirls, the gentle multicolor staple of bead strands.

Blocky pale mineral with two flat cleavage faces meeting near 90° that flash like tiny mirrors in the light.

Not faked; the weight is essentially impossible to imitate convincingly.

Black octahedral spinel from one famous New Jersey district, its companions give it away when the rock blazes green and red under UV light.

Dyed magnesite imitates it constantly in beads, weight and warm-acid fizz identify the real thing.

Dyed look-alikes are rare; mislabeling as smithsonite inflates prices, weight exposes the swap.

Frequently confused with opalite glass in shops, the backlight color flip is the instant separator.

Machine-polished agates are sold as 'Gobi' online, the satin patina and raised eyes are difficult to counterfeit.

Iridescent 'rainbow hematite' coatings are usually goethite/turgite films, natural, though often oversold as rare.

Colorless synthetics and glass stand in for it in budget jewelry; crystal form and hardness are the checks.

Greasy soft gray mineral that writes on paper and blackens fingers, diamond's slippery shadow twin, light and metallic-dull.

Green glass and YAG imitate tsavorite; 'African jade' is usually massive grossular, not jade.

Dyed or man-grown salt crystals exist; humid air alone will slowly dissolve any halite, keep dry.

Quartz is occasionally mislabeled hambergite; the doubling test exposes it in seconds.

Not faked; neglected specimens 'melt' and get resold as worse grades, check surfaces for dissolution rounding.

Not faked; magnetite mislabels are the common error.

Heated and irradiated beryls deepen some golden colors; citrine is commonly upsold as heliodor.

Much 'hiddenite' sold is pale treated spodumene or green glass; chromium-green Carolina stones are genuinely rare.

Black metallic tabular mineral, magnetite's non-magnetic-looking twin that only weakly nudges a magnet and streaks darker than chromite.

Heated greenish stones get sold as finer 'indicolite'; blue glass impostors lack striations.

A plain-looking pale agate slice that detonates into rainbow stripes when light shines THROUGH it, banding fine enough to diffract light itself.

The most treatment-ridden gem on Earth: polymer-impregnated and dyed 'B/C jade' saturates tourist markets, untreated 'Type A' certification is the standard.

Mustard-ochre crusts and sparkly micro-druses in rusty mine zones, the 'yellow boy' of acid rock drainage, with a pale yellow streak.

Dyed look-alike slabs from Brazil are common; genuine Laguna color is layered, varied, and never uniformly neon.

Rarely faked, though ordinary banded Brazilian agate sometimes borrows the famous name, Lakers' iron-red palette and weathered husk are distinctive.

Widely imitated with dyed howlite and dyed jasper, and often dye-enhanced even when genuine; brassy pyrite specks and a clean acetone swab are the tells.

Sharp lazurite crystals command serious prices, beware dyed sodalite or painted marble 'crystals' online.

The name IS the warning: 'lemon chrysoprase' is magnesite; pricing should be magnesite-level, not gem chrysoprase.

Azurite sold as linarite (and vice versa) is the classic mix-up; the acid fizz test settles it.

Water-clear quartz enclosing miniature multicolored 'gardens', mossy greens, creamy plumes, and rusty clouds layered in 3D scenes.

Not faked, but confusion with vivianite is common; vivianite darkens with light exposure while ludlamite keeps its apple green.

Man-made ferrite 'lodestones' exist; natural lodestone is rough and irregular, not molded.

Jewelry labeled marcasite is pyrite (stable, honest trade custom), true marcasite specimens need dry storage.

Black glass and dyed beads ride the name in jewelry; crystal form and heft expose them.

Not faked, no one can manufacture needles this fine; mislabeling among natrolite/scolecite sprays is routine and harmless.

Not faked; pale beryl mislabels occur in flat lots.

Golden needles fine as hair, sprayed in starbursts inside quartz geodes, metallic threads so thin they tremble at a breath.

Graphite's heavyweight twin, blue-silver metallic flakes that smear on fingers but weigh twice what graphite does, with a faint violet-blue cast.

Resinous red-brown heavyweight crystals from pegmatites and black beach sands, the workhorse ore of rare-earth elements, faintly radioactive from thorium.

Rarely faked; quality is graded on 'scenes', dealers may oil cracks on cheap cabs, check with a loupe.

Name misuse is common on pretty multicolor jaspers; documented Owyhee provenance matters to the price.

Often confused with scolecite and selenite in shops; the fingernail test rules out selenite (natrolite resists).

Not faked; repaired crystals reset in natrolite paste exist, inspect contacts.

Olive-drab green needle crusts from old copper mines, heavier than malachite, never fizzing, wearing military-green tones.

Golden pearly mineral that peels into flexible glittering flakes, arsenic's yellow calling card, usually beside its orange-red partner realgar.

Garnets and dark rubies get optimistically labeled 'painite' at gem shows, the price of the real thing makes verification mandatory.

Dyed quartz 'papagoite phantoms' circulate, sealed-in color and trusted provenance are essential at these prices.

Dyed marble composites imitate the green-on-white look; dye rubs off in crevices.

Cavansite sold 'as pentagonite' is the common upsell, stars versus balls settles it.

Bronze granular ore almost always married to magnetic pyrrhotite, the world's chief nickel mineral, itself stubbornly non-magnetic.

Pink glass, morganite, and tourmaline get sold as pezzottaite; density and saturation are quick checks, certificates matter for gems.

The hype invites fraud: quartz and topaz are routinely sold as phenakite, density, luster, and habit checks matter at these prices.

Gilded lead 'nuggets' and brass shavings plague online sales, density testing (or a refusal to test) tells all.

Not faked; routinely mislabeled among brown carbonates, curved faces plus heft plus weak fizz is the sorting key.

Cat's-eye sillimanite is sometimes sold as rarer cat's-eye chrysoberyl, chrysoberyl is notably harder (8.5) and denser.

Cast 'wire silver' fakes exist, poured silver shaped into curls and glued to matrix; genuine wires show growth striations and emerge from the rock, not epoxy.

Not faked; mostly a bead-strand staple sold under loosely applied names.

Rarely faked; some sellers tumble-polish away the diagnostic skin, ironically destroying the feature that names the stone.

Its name comes from Greek for 'treacherous' because miners confused it with lead ore, today the deception runs the other way: gemmy 'golden sphalerite' faceted stones are real but.

Bright orange 'citrine' spirit quartz is usually heat-treated; electric colors are aura coatings or dye.

Not faked; mislabeled acanthite is frequent, the brittleness test separates them.

Unmistakable canary-yellow crystals, light, brittle, resinous, with a faint sulfur smell when rubbed.

Not faked; tennantite/tetrahedrite labels are interchangeable guesses without analysis, buy by specimen quality.

Rarely faked; tumbled agate or dyed stones are sometimes mislabeled 'thomsonite', no ringed fiber eyes, no sale.

Rarely faked, but peridot and green glass get labeled 'sphene', real titanite's fire and doubled back facets are checkable with a loupe.

Not faked; the hazard is the opposite, gorgeous green squares sold as 'pretty crystals' without a radioactivity disclosure.

Not faked; mislabeled as 'wormhole agate' or confused with fossil coral, the tube linings tell the truth.

Not commonly faked; quality varies hugely, top Turkish material with pink ground commands jewelry prices.

Rarely faked, but colored fiber-optic glass (ulexite's man-made cousin) is sometimes sold as 'rainbow ulexite', real ulexite is white and soft.

Green glass 'druzy' and dyed quartz crusts imitate it, real uvarovite's crystals are sharp dodecahedra with color all the way through.

Not faked; occasionally confused with green prehnite or dyed stones, but the radial fans are hard to counterfeit.

Mislabeled pastel jaspers ride on the name; real Willow Creek nodules come from a small Idaho district and cut with porcelain smoothness.

Nearly all big glassy 'zincite crystals' sold are smelter-chimney growths from Poland, gorgeous and real ZnO, but industrial accidents, not mined minerals; honest dealers say so.

Constantly confused with cubic zirconia by name; nearly all blue zircon is heated (accepted); some zircon is mildly radioactive ('low' zircon), jewelry-grade is safe.

Snow-white feldspar with mirror-flash cleavage faces, often as curved fans of thin platy blades (cleavelandite) hosting gem crystals.

Dense-looking but unremarkable pale massive mineral from steamy altered volcanic ground, identified mostly by its acid-altered rock neighborhood and no fizz.

Not faked; mislabeled as garnet or leucite at swap meets, the pale color and featherweight heft sort it out.

Tiny lab-grown anatase exists from research labs but rarely enters the specimen trade; glued composites are the main thing to check.

Assume red or green andesine is copper-diffusion treated unless certificated natural, undisclosed treatment defined this stone's history.

Diamond-lustered colorless-to-straw crystals of absurd heft, often growing as a shell around a gray galena heart.

Dolomite's iron-rich cousin, cream saddle-shaped rhombs that weather to telltale rusty brown and fizz only weakly in cold vinegar.

Apple-green powdery 'bloom' coating weathered ore, the unmistakable green signal that nickel-arsenic minerals lie beneath.

The calcium-rich end of the plagioclase family, blocky pale crystals with feldspar's right-angle cleavage flash, rarer in collections than its siblings.

Stubby black blocky prisms with nearly right-angle cleavages and an eight-sided cross-section, the standard dark mineral of basalt country.

Dark mica that peels into thin flexible glittery sheets with a fingernail.

Brown-green stubby pyroxene with two cleavages meeting near 90°, the magnesium end of the family whose iron-rich shimmer form is bronzite.

The everyday black mineral of speckled rocks, glossy stubby prisms with diamond-shaped cross-sections and oblique amphibole cleavage.

Chalk-white trapezohedral crystals, garnet's 24-faced shape in ghost white, studding dark potassium-rich lavas.

The blocky pink-to-cream feldspar of pegmatite country, right-angle cleavage flashes, often intergrown with quartz in 'graphic granite' runes.

Silvery transparent mica peeling into thin flexible sheets that spring back when bent, nature's original window glass.

The 'greasy quartz that isn't', oily-lustered gray mineral filling quartz's role in silica-starved rocks, but softer and clouding in strong acid.

Goldstone glass impersonates its sunstone form constantly, uniform glitter means glass.

The bronze-amber mica, peels into flexible coppery sheets, paler and warmer-toned than biotite, at home in marbles and ultramafic rocks.

The volcanic feldspar, glassy water-clear tabular crystals frozen in young lavas, like windowpanes embedded in stone.

Size, clarity, origin, treatment, and cut. What sets a stone's price beyond the grade sticker.

Why the same stone is eight dollars on a marketplace and forty in a shop. The cost drivers behind the gap.

Real geological scarcity versus manufactured hype, and how to tell which one you are paying for.

Why a printed COA proves almost nothing for most crystals, and what actually backs a claim.

Cluster, geode, tower, tumble, point. What each form means, and how shape affects the price.

No stated origin, no treatment disclosure, certificates used as proof, and the other signs to read before you trust a seller.

A trustworthy listing names the stone precisely, states origin and treatment, and shows the actual piece. The soft words stand in for missing facts.

How to tell a thoughtfully built set from a bag of vague, dyed padding, and when the price reflects real curation.

Why one stone and one photo appear across many shops at very different prices, and how to tell which store actually held it.

Every hand a stone passes through between the ground and your shelf, and where the chain usually goes dark.

Who actually digs the stones, what artisanal miners earn, and what fair sourcing looks like in practice.

Madagascar is not a war zone. The honest issues are mining safety and fair payment, and how we verify.

The phrase is mostly unregulated for crystals. What it really covers, and what it quietly leaves out.

How to read a country-of-origin claim, what real traceability looks like, and when to stay skeptical.

The stones most often recommended for rest, and four rules for using one under a pillow without ruining it.

How people traditionally combine stones, framed as practice and tradition, with no claims attached.

Where people traditionally place stones around a home, honestly framed and free of health claims.

Standardized by American jewelers in 1912, built on a much older tradition. Why some months carry more than one stone.