Conch Pearl

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June Birthstone

A conch is a marine gastropod or, more simply, a large sea snail. Conchs are valued for their meat, shell and non-nacreous pearls. Conch pearls are formed by concentric layers of fibrous calcium. This layering often produces a much-desired flame structure, which is characteristic of conch pearls. Because they are a calcareous concretion, the pearls have a porcelain finish and luster, very similar to the interior of the conch shell. Conch pearls are not cultured, but are usually found as a by-product as fishermen clean their catch for conch meat. The gems are usually baroque or oval in shape and generally a salmon-colored orange-pink.

Conch Pearl Polished
Conch Pearl Classification
Common Name Conch Pearl
Species Pearl
Conch Pearl Optical Properties
Transparency Translucent - Opaque
Refractive Index 1.530-1.685
Birefringence 0.155
Polariscope Reaction Aggregate (AGG)
Fluorescence SWUV: Variable
LWUV: Variable
Pleochroism None
Conch Pearl Characteristic Physical Properties
Hardness 2.5-4
Specific Gravity 2.830-2.870 Typical:2.850
Toughness Fair
Inclusions Conch pearls have a flame like structure and does not have nacre but a porcelain like finish.
Luster Dull, Vitreous
Stability Poor
Fracture Uneven
Cleavage None
Conch Pearl Chemistry & Crystallography
Chemical Name calcium carbonate, conchiolin and water
Chemical Formula CaCO3 with H2O and other organic materials
Crystal System NA
Chemistry Classification Carbonate

Conch Pearl Colors

  • Brown Conch Pearl Brown
  • Pink Conch Pearl Pink
  • White Conch Pearl White
  • Yellow Conch Pearl Yellow

Countries of Origin


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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.