Take a look at the six treated color pearls (left) and six naturally colored pearls (right). The samples included both freshwater and saltwater pearls of colors frequently seen in the pearl market.
Useful link:
https://www.gia.edu/gems-gemology/spring-2020-labnotes-spectroscopy-colored-pearl-treatment-screening
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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