Global Gemology - Rare Gems & Jewels
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RED CORAL

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Precious red coral was custom cut to fit this vintage platinum & diamond ring setting
Precious red coral & diamond ring, in platinum
Species:  Calcareous Coral
​​Mohs Hardness:  3 to 4 out of 10
Color:  Medium to dark red
RI:  1.486 to 1.658
Birefringence:  0.172 (birefringence blink)
SR/DR/AGG:  AGG
Fluorescence:  Inert to orange to pinkish orange under LW and SW.  Dark red coral can be inert to dull red to purplish red
SG:  2.65 (+/-0.05)
Routine Treatments:  None
Additional Enhancements:  Dyeing, polymer impregnation

SHOP CORAL JEWELRY

Red Coral Facts

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Vintage, hand-woven precious red coral bead, and gold bead earrings.  Made in Italy.
Red coral and gold bead cluster earrings

Coral is a living marine organism that forms in branch-like structures in tropical and sub-tropical ocean waters.  When the coral polyps die, a dull, hardened skeleton remains that is polished to a waxy luster.

Most coral is white to cream in color.  Red to pink colored coral are the most valuable, and are considered precious coral.

Like pearl, coral is an organic gem that has been cherished for centuries.

Hand-carved coral cameos were popular as far back as the Georgian and Victorian Eras (circa the 18th & 19th Centuries) and are still prized by knowledgeable collectors today.

Red Coral Gallery

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All photos courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA)

  • HOME
  • ABOUT
  • SHOP
  • SERVICES
    • APPRAISALS
    • EXPERT WITNESS TESTIMONY
    • SELL YOUR JEWELRY
  • GEMOLOGY
    • GEM ENCYCLOPEDIA
    • THE ART OF GEMOLOGY
  • JEWELRY EDUCATION
    • DIAMOND FACTS
    • JEWELER DIRECTORY
    • JEWELRY PERIODS
    • POCKET WATCHES
    • NATIVE AMERICAN JEWELRY
  • GLOSSARY