Black Onyx Oval Cabochon

A staple color in jewelry designs that complements nearly any gemstone, this black oval onyx cabochon is ideal for adding depth and drama to custom designs. Set it in a bezel mounting to make a simple pendant or combine it with complementary-color gemstones to create complex necklace designs as well as matching sets including earrings and bracelets. 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: 14 x 10mm, 30 x 22mm, 10 x 8mm, 16 x 12mm, 12 x 10mm, 25 x 18mm, 6 x 4mm, 8 x 6mm, 40 x 30mm, 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
Cutting center: China