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Gemology
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Source URL: www.gem-a.com
Language: English
- Date: 2008-11-11 03:45:34
Chemistry
Tairus
Pearl
Sapphire
Synthetic alexandrite
Cultured pearl
Gemology
Emerald
Eastern oyster
Gemstones
Phyla
Protostome
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Source URL: www.bgs.ac.uk
Language: English
- Date: 2007-06-12 12:22:27
Matter
Sapphire
Lapis lazuli
Beryl
Ruby
Spodumene
Jewellery
Gemology
Emerald
Gemstones
Crystallography
Chemistry
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