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gptkb:Argyle_Pink_Diamonds_collection
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unique color saturation
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gptkb:natural_topaz
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analyzed using refractive index and specific gravity
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gptkb:Kashmir_Sapphire
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high refractive index
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gptkb:Yogo_Sapphire
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high refractive index
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gptkb:Thai_rubies
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unique gemological properties
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gptkb:Argyle_pink_diamonds
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unique gemological properties
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gptkb:Burmese_ruby
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high refractive index
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gptkb:Padparadscha_Sapphire
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Refractive index 1.76-1.77
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gptkb:Ceylon_sapphire
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varies by specimen
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gptkb:Imperial_Green_Jadeite
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specific gravity, refractive index
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