Black Onyx 18 x 13mm Oval High-Dome Cabochon

This oval high-dome black onyx cabochon is a great choice for adding depth and drama to custom jewelry designs. Use it to create a simple, single-gemstone pendant or ring, or combine it with gems of complementary colors for multi-gem designs. Premium high-dome cabochons are much more substantial and increase the profile of the gemstone in your design.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: 18 x 13mm
• 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
• Weight: 0.000 kg