In Thailand, glass and dopping varnish is commonly used to treat black star sapphires for variety of reasons. Buyer beware. If in doubt, always consult a reputable gem testing laboratory.
P.J.Joseph's Weblog On Colored Stones, Diamonds, Gem Identification, Pearls, Organic Gems, Gem And Jewelry Enterprises, Gem Markets, Watches, Gem History, Books, Comics, Cryptocurrency, Designs, Films, Flowers, Food & Beverages, Hospitality, Small Luxury Hotels, Graphic Novels, Technology, Artificial Intelligence, Robotics, Energy, Education, Environment, Music, Art, Commodities, Travel, Photography, Antiques, Random Thoughts, and Things He Like.
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