Retail only
$2.00per piece
From $2.40per kg
Less per kg from 20 kg
1 / 2
$2.00per piece
From $2.40per kgWholesale
In stock
Deep, glossy black stones with an even colour and a mirror-like polish. Black onyx is a chalcedony, a microcrystalline quartz, prized for its uniform jet-black colour.
Priced per piece. Every stone is natural and hand-picked, so colour, pattern and size vary slightly from the photographs.
| Property | Detail |
|---|---|
| Mineral / group | Chalcedony (onyx) |
| Chemical composition | SiO₂ |
| Colour range | Jet black, sometimes with faint banding |
| Mohs hardness | 6.5–7 |
| Lustre | Vitreous to waxy |
| Crystal system | Trigonal (microcrystalline) |
| Specific gravity | 2.55–2.70 |
| Transparency | Opaque |
| Common treatments | Often dyed: most black onyx is agate coloured black |
| Typical origins | Brazil, Uruguay, India, Madagascar |
Retail only
$2.00per piece
From $2.40per kg
Less per kg from 20 kg
Retail only
$2.00per piece
From $2.40per kg
Less per kg from 20 kg
Retail only
$2.00per piece
From $2.40per kg
Less per kg from 20 kg
Retail only
$2.00per piece
From $2.40per kg
Less per kg from 20 kg