Richard W. Hughes + John I. Koivula rexamines why and how curved growth lines and gas bubbles occur in Verneuil (flame-fusion) synthetic corundum @ http://www.ruby-sapphire.com/verneuil-synthetic-corundum-dangerous-curves.htm
A must read.
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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