Black Onyx

Black Onyx showcases a deep, lustrous black color and a beautifully polished surface. A member of the chalcedony family, this classic gemstone is admired for its timeless elegance and striking contrast against sterling silver. Its bold, versatile appearance makes Black Onyx a popular choice for Southwestern jewelry and contemporary designs alike.

Distinctive characteristics

  • Color: Deep black, sometimes with subtle gray or white banding.

  • Composition: Chalcedony, a microcrystalline form of quartz.

  • Appearance: Smooth, opaque, and highly polished with a glassy to waxy luster.

  • Hardness: Approximately 6.5–7 on the Mohs scale.

  • Origin: Found in several regions worldwide, including Brazil, India, Uruguay, and Madagascar.

  • Jewelry: Popular in sterling silver rings, pendants, earrings, bracelets, necklaces, and Southwestern jewelry.

Where is Black Onyx found?

Black Onyx and the chalcedony used to produce it are found in several countries:

  • Brazil: One of the largest commercial sources, particularly Rio Grande do Sul.

  • India: Important deposits and a long tradition of gemstone cutting and polishing.

  • Uruguay: Known for agate and chalcedony deposits.

  • Madagascar: Another source of chalcedony suitable for jewelry.

  • Mexico and the United States: Additional sources of onyx and related chalcedony.