Diamond grading is the specialty of the American Gem Society Laboratories and the Society has developed its own cut, color, and clarity standards.
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.
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Most diamonds with an overall cut graded by GIA as "Excellent" (with Excellent symmetry as well) or American Gem Society as "0" (or "Ideal") will have some sort of hearts and arrows pattern when seen through a viewer, although the pattern may not be perfect.
Speakers included diamond cutters Maarten DeWitte, Brian Gavin and Gabi Tolkowsky; American Gem Society representatives James Caudill and Peter Yantzer; technology developers Garry Holloway, Udi Lederer, Janak Mistry, Yuri Shelmentiev and Sergey Sivovolenko, Octonus; and researchers V.K. Baranov, A.M.