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These are A-grade Blue Onyx raw stones from Minas Gerais, Brazil. Ours is natural banded chalcedony in soft blue-gray layers, not the dyed calcite often sold under this name. Each piece runs 1-2 inches at Mohs 6.5-7, fully natural and untreated. A favorite focus stone for desks and study corners.
Blue Onyx is a banded variety of Chalcedony (microcrystalline quartz), with a Mohs hardness of 6.5 to 7. The name "onyx" historically refers to any banded chalcedony, with the prefix denoting color.
Honest note: in the broader trade, "Blue Onyx" is sometimes used loosely for banded blue calcite or dyed material. The pieces we carry are natural banded chalcedony with soft blue coloration from trace minerals during formation, not dyed.
It forms in cavities and veins within volcanic rocks, where silica-rich fluids slowly deposit microcrystalline layers over time.
Blue Onyx is traditionally associated with calm communication, focus, emotional steadiness, and gentle protection. Many people work with this stone for clear-headed thinking during difficult conversations, settling racing thoughts, and finding their voice without overheating.
It's a steady, grounded stone in the throat-energy family.
These are traditional associations drawn from historical practice. This stone is not a substitute for medical or mental health care.
Offered as a starting point for your own practice.
Blue Onyx sits at 6.5-7 on the Mohs scale, about as hard as glass, so it handles daily use but will scratch against harder stones. Harder stones will scratch it, so store it on its own.
Natural blue onyx from Minas Gerais, Brazil. Each piece is hand finished with natural jojoba oil, which deepens the color and texture already in the stone. Any treatment beyond that finish is disclosed on this page.
You'll receive pieces from the same batch photographed, weighed to the amount you choose. Every piece passes our quality control and meets or exceeds what you see in the photos. Single specimens are listed separately and say so.
Each piece measures 1 to 2 inches on its longest side and weighs 20 to 50 grams. About 12 to 20 pieces per pound at this size, and each option shows its piece count.
Grade A. Soft banding and natural color variation, with the uneven edges you expect from a raw stone. Grades reflect visual quality within a batch. A is standard, with typical inclusions. AA shows stronger color, cleaner surfaces and tighter sizing. AAA is the top 10 to 15 percent of a batch. Every lot is inspected and graded by our team in Rockville, Maryland, not taken on the supplier’s word.
Minas Gerais, Brazil. It came to us through a community partnership, one of the sourcing models we publish and stand behind.
Every lot is inspected and graded by our expert team before it is listed, not taken on the supplier's word. A on this listing means stronger color, cleaner surfaces and tighter sizing than the batch average. Pieces that miss the mark never reach the shop.
How We GradeSourced through a regional cooperative or community-based workshop. Processing and economic benefit stay local, which means more of the value reaches the people doing the work. We say what we know and where our tracing stops.
Our Sourcing StandardsEverything we sell is natural in origin: never synthetic, never dyed, never coated. Where a stone has been heated, irradiated or stabilized, which is common in the trade for some species, we say so on the listing. If a piece is not as described, return it within 90 days of delivery.
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