Onyx is a variety of Chalcedony, a member of the Quartz family with a hardness of 7. Its crystal system is a hexagonal (trigonal). Onyx is defined as a banded Chalcedony in which thin lines of banding are parallel. This banded Onyx is frequently used in carving cameos, since the layered colors allow the necessary contrast of background with foreground. 

Black Onyx | Tumbled

Localities: Italy, Mexico, United States, Russia, Brazil, South Africa

Rarity: Readily Available

Hardness: 7

*Price is per individual piece unless noted. Due to the natural variations of each piece, please note that the actual item you receive may not appear exactly as pictured. Rest assured, however, that our dedicated team will do their best to hand-select the most attractive specimen(s) that we have in stock at the time of your order. Sizes and weights are always approximate.