Cushion Flat Top Single Bevel Genuine Black Onyx

Black Onyx — also known as black agate — is dyed black chalcedony. Chalcedony is composed of microscopic quartz crystals not visible to the naked eye. Natural black chalcedony is exceptionally rare; virtually all black chalcedony on the market is grey chalcedony that has been chemically treated to achieve its deep, uniform black color. Black Onyx is the top-selling chalcedony in the gemstone market and has a rich history as a staple of Art Deco jewelry design.

These cushion flat top single bevel cabochons offer a classic shape well-suited for rings, pendants, brooches, and other settings requiring a polished, opaque stone with clean lines. Each stone presents a uniform opaque black appearance ideal for both contemporary and vintage-inspired metalwork.

Clean with warm, soapy water. Use of an ultrasonic or steam cleaner is generally considered safe for these stones.

Features

• Genuine black onyx cabochons — dyed black chalcedony
• Cushion flat top, single bevel cut for versatile setting options
• Uniform opaque black color throughout
• Treatment: Dyed
• Safe to clean with warm soapy water; ultrasonic and steam cleaning generally safe

Specifications

Available Options