GDL

Global Diamond Laboratory was established in June, 2009. We are a full service gem stone and diamond grading company. The purpose of GDL grading certificate is to confirm the authenticity of the gem stone and diamond. At the same time, to describe accurately the characteristics and the quality of gem stones and diamonds. The GDL certificate confirms to the international standards for grading polished diamond. Therefore, the GDL certificate is a true and authentic identity voucher of a diamond worldwide.