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.
After the publication of the Gemological Institute of America's ‘brilliance’ report in 1998 this passion became a crusade to improve the cut quality of all diamonds.
There are also a number of laboratories affiliated to CIBJO.
The majority of Graff diamonds are laser engraved with unique Gemological Institute of America tracking numbers, which whilst invisible to the naked eye, allow for its origin to be traced.
Tay Thye Sun has been practicing gemology after he graduated from the Gemological Institute of America since 1980.
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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.
It is judged to be internally flawless and 'D' color by the Gemological Institute of America.