Onyx, a type of opaque chalcedony, occurs naturally in black and is generally dyed to achieve a more uniform color.
These black onyx cabochons are specifically calibrated to fit corresponding size bezel cups, so you know the size you buy will fit properly every single time.
Stone shape: Oval
Stone size: 16 x 12mm
Stone type: Natural
Color: Black
Mohs hardness: 6.5–7
Treatment: Dyed (D)
Country of origin: TAIWAN
Please Note: Care: Avoid heat and harsh chemicals. Ultrasonic and steam cleaning are usually safe.
