Black Onyx 12mm Round Rose-Cut Cabochon

With an opaque black color and a rose cut that catches the light, this round black onyx cabochon is ideal for adding depth and drama to custom jewelry designs. A staple color in jewelry designs that complements nearly any gemstone, 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 gems. It is a hard gemstone and takes a high polish; since ancient times, onyx has been a favorite for carving.A favorite of yesteryear, this rose-cut faceting features a flat base (no pavilion) and a crown made up of triangular facets.

• Gemstone Type: Onyx
• Stone Shape: Round
• Stone Size: 12mm
• Stone Type: Natural
• Color: Black
• Enhancement: Heat-treated (H)
• Mohs Hardness: 6.5–7
• Refractive Index: 1.53–1.54
• Specific Gravity: 2.55–2.7
• Brand: AGTA
• Weight: 0.000 kg