The first US graduate of Gem-A's Diploma Course, in 1929, was Robert Shipley who later established both the Gemological Institute of America and the American Gem Society.
Gemology |
That same year, in an article on "Faceting Limits" in Gems and Gemology, the magazine of the Gemological Institute of America, he identified the effect of an observer's head blocking rays of illumination for the main facets of a number of gem materials, including diamonds.
Richard W. Hughes is an American gemologist and award winning author, known as an authority on Corundum: rubies and sapphires.
Tay Thye Sun has been practicing gemology after he graduated from the Gemological Institute of America since 1980.