Diamond deposits are found in two types of rock Kimberlite—an igneous rock that transports diamonds to the surface Lamproite—an igneous rock, rarer than kimberlite, that transports diamonds to the surface Their mineral and chemical compositions are fairly similar. 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.
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. The proportions provide a primary component of the overall cut grade Other critical factors include polish, symmetry, and verbal descriptions of the girdle and culet (see, “finish, culet size and girdle thickness Categories of the gia diamond cut grading system” for details). Illustrates the gia cut grades and their relative position in the gia diamond cut grading system
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