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The classification system of diamonds, its importance, and laboratory testing processes. By Wade Abel, CG, Director of Gemological Services, AGS Laboratories You may have heard of diamond type; however, you may not know how important this classification system is and how it is used at AGS Laboratories. People may speak about diamond type in reference to rarity, which it can indicate. However, there are other important reasons for knowing the type of a diamond, especially when it comes to identification and detection of some very important factors. What is Diamond Type? ºÚÁÏÀÏ˾»ú are classified according to their chemical makeup. We