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Unusual Gem Categories
As the title says: these are
Unusual Gem Categoies
.
Black Gems
Diamagnetic Gems
Fluorescent Gems
Magnetic Gems
Metallic Gems
Paramagnetic Gems
Photochromic Gems
Piezoelectric Gems
Poisonous Gems
Pyroelectric Gems
Radioactive Gems
Rare Earth Elements Gems
Tenebrescent Gems
Triboluminescent Gems
Water Soluble Gems