In the gem trade, "carat" is often used as the unit of quality. The term carat, originally in Greek, means the seed of a kind of "carob tree" that grows on the Mediterranean coast of Europe. Les anciens croyaient que la qualité de chaque graine était la même, donc il a été utilisé comme poids [...]
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The cabochon type of gemstones is also called the body type or convex type. It consists of a polished arc-shaped top surface and a rough ground but not polished bottom surface. Its main feature is that the ornamental surface is a polished curved surface. Curved cuts are divided into three categories according to the top [...]