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Set with black onyx and white mother-of-pearl, this oval mosaic cabochon offers a monochromatic appearance. The cab is a perfect centerpiece for a design custom-built around it, especially a pendant or a brooch.

Named for its resemblance to the finish and color of pearls, mother-of-pearl cabochons are made from the hard, iridescent material that forms on the inside of some shells and shellfish. It is used for inlay and to create beads, cameos, cabochons, buttons, and other ornamental objects.

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 stones. It is a hard stone and takes a high polish; since ancient times, onyx has been a favorite stone for carving.

  • Cutting Center : China
  • Stone size : 25 x 18mm
  • Stone(s) shape : Oval
  • Stone type : Natural
  • Color : Black & White
  • Enhancement : None (N)
Additional Specifications:
  • Mother-of-Pearl:
    Mohs hardness - 3.5
    Refractive index - 1.530–1.685
    Specific gravity - 2.86

    Black Onyx:
    Mohs hardness - 6.5–7
    Refractive index - 1.530–1.543
    Specific gravity - 2.55–2.70

Catalog page: 2019-2020 Gems and Findings & Display and Packaging Catalog p.767