Heat-Treated Citrine
Heat-Treated Citrine is treated quartz (heated amethyst), SiO₂. In the hand, it rates 7 on the Mohs scale, and it runs burnt orange and amber-orange tips. Burnt-orange color crowded into crystal tips over frosty-white opaque bases, in geode/druzy formations natural citrine almost never takes. Brazilian and Uruguayan amethyst, kiln-heated to ~450°C at the source.
The geology.
Heat-Treated Citrine carries the formula SiO₂. It belongs to the trigonal system. The trade files it under treated quartz (heated amethyst).
It sits at 7 on the Mohs scale. The surface reads vitreous. Light behaviour is transparent to translucent. Specific gravity runs 2.65. The streak is white. It breaks with conchoidal fracture.
Burnt-orange color crowded into crystal tips over frosty-white opaque bases, in geode/druzy formations natural citrine almost never takes.
Common cuts are geode points, clusters, 'citrine cathedrals' or tumbled.
The origins.
Brazilian and Uruguayan amethyst, kiln-heated to ~450°C at the source.
On value, the database notes: very affordable; priced below natural citrine.
Traditional associations.
In energy work traditions, sold with citrine's abundance associations, buyers deserve to know the color came from a kiln.
Included for completeness. Tradition is worth knowing about, and it is worth keeping separate from the mineralogy.
Spotting the real thing.
Burnt-orange color crowded into crystal tips over frosty-white opaque bases, in geode/druzy formations natural citrine almost never takes.
This IS the treatment: the vast majority of retail 'citrine' clusters and points are baked amethyst, usually undisclosed.
| Looks like | How to tell them apart |
|---|---|
| Natural citrine | Natural citrine is even pale straw-to-smoky yellow throughout, usually single crystals, never white-based orange druzy |
| Orange calcite | Calcite is soft and fizzes |
| Tangerine quartz | Tangerine quartz wears a rusty surface coating, not internal orange color |
At-home tests.
These checks cost nothing. Daylight, a 10x loupe and a little patience are the whole kit for heat-treated citrine.
| Test | What you should see |
|---|---|
| Color gradient | deep orange tips fading to white base |
| By eye | Druzy geode form = treated (citrine rarely forms geodes) |
| Still real quartz | scratches glass |
If these checks leave you unsure, that is what appraisers are for. Do not file, heat or soak a piece to find out.
Care & handling.
At 7 on the Mohs scale it stands up to everyday wear. It will still chip on a hard knock, so treat edges and points with respect.
It breaks with conchoidal fracture, which is worth knowing before you set it or drop it.
Most damage happens during cleaning, not wearing. Avoid steamers, ultrasonic tanks and anything from under the sink.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is SiO₂. Crystal system: Trigonal. Specific gravity: 2.65. Streak: White. Cleavage and fracture: Conchoidal fracture.
How it reaches the market
Brazilian and Uruguayan amethyst, kiln-heated to ~450°C at the source.
What it gets confused with
Natural citrine: Natural citrine is even pale straw-to-smoky yellow throughout, usually single crystals, never white-based orange druzy. Orange calcite: Calcite is soft and fizzes. Tangerine quartz: Tangerine quartz wears a rusty surface coating, not internal orange color.
What it is worth
Very affordable; priced below natural citrine.
Where buyers get caught
This IS the treatment: the vast majority of retail 'citrine' clusters and points are baked amethyst, usually undisclosed.
One more thing
The transformation is honest chemistry, heating shifts the same iron that made the amethyst purple into orange.
An education-first guide.
There is nothing to buy on this page. Heat-Treated Citrine is not part of our catalogue, and the guide is here anyway because somebody searching the name deserves a straight answer.
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