In addition to the renowned 4Cs, buyers should be familiar with the subsequent key facets of a radiant cut diamond grading report or certificate, as illuminated in the image below.
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Measurements: This holds significant importance as it furnishes the buyer with information concerning the surface size of the diamond, thereby indicating the apparent size of the diamond in millimeters. Furthermore, it provides the length-to-width ratio by dividing the length by the width (in this instance, yielding a ratio of 7.69/65.81=1.32).
Fluorescence: Regard this as the 5th C. Given the diamond's F color grade, avoiding fluorescence is the optimal choice in this case. However, medium blue fluorescence should not raise as much concern as strong blue fluorescence.
Comments: This section will showcase clarity factors and shed light on whether the diamond has undergone clarity enhancement, utilizing methods like laser drilling or color enhancement, among others. Additionally, remain attentive to comments such as "clarity grade based on clouds," a concerning indicator within clarity grades of VS2 and below. The laser inscription of the report number on the girdle is positioned above the comments section (an optional service for enhanced verification).
Proportions: This chart assumes utmost importance in evaluating the diamond's cut. Specifically, focus on the table percentage (60% in the given example - excellent), depth percentage (69.2% - very good), girdle (slightly thick- very good), and culet (none - excellent).
Clarity Characteristics: This section will delineate the types of inclusions and their respective locations. It proves invaluable for buyers seeking to avoid diamonds with conspicuous inclusions at the center. Furthermore, these details facilitate correlating the report with the diamond, as these inclusions serve as the diamond's distinctive birthmarks.