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, 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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