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In stock
Good quality, good price and excellent customer service.
Lisa J. · Verified buyer · June 2026
These are AA-grade Black Onyx tumbled stones from Minas Gerais, Brazil, sold by the piece or by the pound. Black onyx is a chalcedony, the microcrystalline form of quartz, polished to a uniform opaque black. Each piece runs 0.75-1.25 inches at Mohs 6.5-7 and is sourced through a community partnership. A favorite grounding stone for pockets.
Black onyx is deep, uniform black with a glassy polish when it's cut right. Most market material has been dyed for consistent color, so if the seller doesn't mention that, assume it. The Romans carved it into cameos, and most commercial black onyx on the market has been dyed for consistent color since naturally solid-black material is rare.
This piece comes from Minas Gerais, Brazil. Worth knowing: a lot of the black onyx on the market is dyed. What we carry is natural and untreated.
Black onyx has long been used in practices around a sense of groundedness when things feel uncertain, staying connected to your body and the moment, and settling into who you already are. It's traditionally linked to the root chakra. If that resonates, hold one in your non-dominant hand for a few breaths when things feel shaky. There's no single right way to carry it.
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.
Black 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. Keep chemical cleaners away from it; they can etch the surface.
Natural black onyx from Minas Gerais, Brazil. Some commercial black onyx is dyed to achieve uniform black; ours is sourced from natural-color deposits.
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 0.75 to 1.25 inches on its longest side and weighs 5 to 15 grams. About 40 to 64 pieces per pound at this size, and each option shows its piece count.
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.
This batch is from 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. AA 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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