Black Onyx 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.

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Gemstone type: Onyx
Stone shape: Oval
Stone size: 18 x 13mm, 25 x 18mm
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
Cutting center: Taiwan