Short notes from Seylan Gems on how to judge a stone before you buy. Start with windowing, then use the product page for carat weight, treatment, and price. These notes are for shoppers, not a laboratory report.
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Sapphire
Ruby
Alexandrite
Emerald
Padparadscha
Aquamarine
Spinel
Garnet
Peridot
Tourmaline
Tanzanite
Citrine
Quartz
Chrysoberyl
Apatite
Topaz
Amethyst
Lolite
Zircon
Sinhalite
Cats Eye
Opal
