Gia laboratory graders visually assess girdle thickness at 10x magnification with the diamond in profile view, and consider each of the 16 valley positions and their thicknesses relative to the diameter of the diamond. As creator of the 4cs and the international diamond grading system,tm gia is the global authority and trusted source for unbiased diamond quality assessment This guide is devoted to helping you choose both well and wisely when shopping for a diamond. Perfect diamond octahedrons are among the most striking of all mineral crystals The diamond deposits of borneo are believed to share with india the distinction of being the earliest worked diamond mines in the world (see box), although researchers have not been able to pinpoint the exact date that mining began. This overview summarizes the two diamond growth processes
It explores the major trends observed by gia since 2007, the year it began issuing synthetic diamond grading reports. Illustrates the gia cut grades and their relative position in the gia diamond cut grading system
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