Black Onyx 8mm Round Calibrated Cabochon Sold By each | 78089

This round black onyx cabochon is a great choice for adding depth and drama to custom jewelry designs. A staple color in jewelry designs that complements nearly any stone, this cab is ideal for one-of-a-kind pendant and bracelet designs.

Onyx, a type of opaque chalcedony, is naturally black and is generally dyed to achieve a more uniform color—it is the most common black gemstone and is popular for creating a striking centerpiece and for adding contrast to designs that include lighter and/or more colorful stones. It is a hard stone and takes a high polish; since ancient times, onyx has been a favorite stone for carving.

Rio Grande's calibrated cabochons are calibrated to fit Rio Grande's corresponding size bezel cups, so you know the size you buy will fit properly every single time.

Specifications:

• Cutting Center : HongKong
• Stone size : 8.0mm
• Stone(s) shape : Round
• Material : Onyx
• Stone type : Natural
• Color : Black
• Mohs hardness : 6.5–7
• Refractive index : 1.53–1.54
• Specific gravity : 2.55–2.70
• Treatment : Dyed (D)