Rob Bates was spot on. There is no easy answer. There are good gem testing laboratories and they good a good job detecting treatments/synthetics, and even help recover stolen goods. We are living in interesting times.
Useful links:
http://www.jckonline.com/1999/07/01/going-cert-less
http://www.jckonline.com/2011/12/21/why-jewelers-are-doing-their-own-diamond-grading
http://www.jckonline.com/blog/Cutting_Remarks/16050-De_Beers_Gets_Into_the_Lab_Business.php
http://www.jckonline.com/blogs/cutting-remarks/2011/06/08/vegas-blogging-problem-diamond-certs
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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