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Precious Gems
Emerald
Ruby
Blue Sapphire
Multi Color Sapphire
Semi Precious Gems
Andalusite
Apatite
Aquamarine
Phenomenal Gems
Alexandrite
Alexandrite Cats Eye
Beads
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Diamond Beads
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14K JEWELRY
22K JEWELRY
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CLEARANCE
GEMS ENCYCLOPEDIA
REVIEWS
MEMBERSHIP
HOME
COLLECTIONS
Precious Gems
Emerald
Ruby
Blue Sapphire
Multi Color Sapphire
Semi Precious Gems
Andalusite
Apatite
Aquamarine
Phenomenal Gems
Alexandrite
Alexandrite Cats Eye
Beads
Matching Sets
Diamond Beads
Jewelry
14K JEWELRY
22K JEWELRY
Findings
CLEARANCE
GEMS ENCYCLOPEDIA
REVIEWS
MEMBERSHIP
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Search our store
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Gem Encyclopedia
Gem Encyclopedia
GIA’s Gem Encyclopedia is a virtual journey through the science and lore of gemstones from across the globe. Each precious stone page features additional detailed gemological information, a buyer’s guide, photos, videos & research.
