To determine the cut quality of a diamond, a 3D analysis of the diamond is made using an optical measuring device, and the ratios of its dimensions to each other and the angles of the corners are determined. The relationship between these ratios and angles is the most important factor determining how light enters and exits the diamond. It is possible to determine the degree of sparkle and sparkle that the light provides to the diamond using these ratios and angles.

Since the ideal proportions accepted by everyone for diamond shapes other than round-cut diamonds have not yet been established, laboratories such as GIA, HRD, and AGSL do not give a grade regarding the cut quality of these different shapes.

Polish refers to the smoothness of the facets of a diamond, and symmetry refers to the harmony of the facets with each other. Although these two issues are of great importance for the sparkle of the diamond, the main beauty of the diamond is related to the quality of its cut.

Fluorescence is the term used to express whether a diamond changes color when exposed to ultraviolet light. Although no factor changes the beauty of the diamond, diamonds with high fluorescence can be purchased in the diamond market at a more affordable price than diamonds with no or little fluorescence. In this sense, high fluorescence diamonds can be seen as an opportunity.

Clarity is a measure of quality that describes the number and size of small flaws in a diamond. Since these flaws are usually large enough to be seen only with a magnifying glass, they do not affect the beauty of the diamond. The sparkle and brilliance of a diamond make it almost impossible to see these small flaws. Diamonds with visible blemishes and flaws are not sold at Gilya Pırlanta. In SI2 and better grades, which contain invisible flaws, these flaws do not harm the beauty of the diamond.

The main diamond certificates that are generally accepted in the world are HRD (Hoge Raad voor Diamant – Higher Board of Diamonds, Belgium), GIA (Gemology Institute of America, U.S.A.), and EGL (European Gemology Laboratory). ), IGI (International Gemological Institute), AGSL (American Gem Society Laboratories, America), and IDL (International Diamond Laboratories).