Pearl Physical Properties

Pearl Physical Properties loose sale price & black Pearl Tahitian south sea Information

CHEMISTRY CaCO3 (aragonite, the outer layer) about 82 - 86%, conchiolin 10 - 14%, water 2%.
CRYSTALLOGRAPHY Aragonite is orthorhombic, with crystals radially oriented.
REFRACTIVE INDEX 1.53 - 1.69
HARDNESS 2.5 - 4.5
SPECIFIC GRAVITY 2.6 - 2.78.
CLEAVAGE None
HEAT SENSITIVE Yes

WEARABILITY* Good
SPECIAL CARE INSTRUCTIONS Avoid heat and all chemicals, including perfume and other cosmetics.

ENHANCEMENTS Dying, common

*Wearability is graded as Excellent, Very Good, Good, Poor, and Forget It!
For more details see the article on "Hardness and Wearability."