There will be always news ways to enhance colored stones because of new technology, rough materials from new sources, money, with a bit of gambling mindset.
Useful link:
https://www.gia.edu/gems-gemology/winter-2018-gemnews-microscopic-observations-blue-sapphires-treated-heat-pressure
P.J.Joseph's Weblog On Colored Stones, Diamonds, Gem Identification, Synthetics, Treatments, Imitations, Pearls, Organic Gems, Gem And Jewelry Enterprises, Gem Markets, Watches, Gem History, Books, Comics, Cryptocurrency, Designs, Films, Flowers, Wine, Tea, Coffee, Chocolate, Graphic Novels, New Business Models, Technology, Artificial Intelligence, Robotics, Energy, Education, Environment, Music, Art, Commodities, Travel, Photography, Antiques, Random Thoughts, and Things He Like.
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