Rectangle 12 x 10mm Black Onyx Cabochon Stone, Sold By each | 67929

Onyx, a type of opaque chalcedony, occurs naturally in black and is generally dyed to achieve a more uniform color. Stone shape: Rectangle Stone size: 12 x 10mm Color: Black Mohs hardness: 6.5–7 Treatment: Dyed (D) please note: Care: Avoid heat and harsh chemicals. Ultrasonic and steam cleaning are usually safe.^