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Sapphire
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Ruby
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Alexandrite
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Pearl
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Tourmaline
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Garnet
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Opal
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Spinel
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Zircon
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Tsavorite
Information about Gemstones
Gem Mines and Blue Sapphires in Sri Lanka
Heated blue sapphires with an unusual color distribution - a work in progress
Treated Blue Sapphires from Sri Lanka
Ceylon’s Gem Mines by Peter Bancroft
