Black Onyx 20 x 15mm Oval Cabochon

Add depth and drama to your jewelry designs with this black onyx oval cabochon. This cab complements any metal and is ideal for one-of-a-kind 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.

• Gemstone Type: Onyx
• Stone Shape: Oval
• Stone Size: 20 x 15mm
• Stone Type: Natural
• Color: Black
• Enhancement: Dyed (D)
• Mohs Hardness: 6.5–7
• Refractive Index: 1.53–1.54
• Specific Gravity: 2.55–2.7