Color
Color refers to the natural body color of a gemstone and not to the reflection of spectral colors that flash when it moves. The less color a diamond exhibits, the higher the rarity, and therefore the higher the value.
Clarity
Clarity refers to how clean or clear a gemstone is with respect to natural microscopic characteristics that were trapped within while the gemstone was forming. Internal characteristics are known as inclusions, and characteristics on the surface of the gem are known as blemishes.
Cut
Cut refers not to the shape, but to the balance of proportion, symmetry and polish achieved by the gemstone cutter. The extent of how well a gemstone is cut is directly related to its overall beauty. When correctly cut, the gemstone's ability to reflect and refract light is greatly enhanced.
Carat
Carat is the traditional measuring unit of a diamond's weight (1 carat = 200 milligrams). A carat is divided into 100 "points," so the same diamond can be represented as weighing a carat and a half, 150 points or 1.50 carats. Moissanite stones are about 15 - 18% lighter than diamonds. Therefore, while a 6.5mm round diamond weighs 1.0 carat, a 6.5mm moissanite weighs 0.83 - 0.85 carat. However, the two stones would be the same actual size: 6.5mm in diameter.
In order to minimize the confusion this can create, all stones are listed on SHEBADISE with their actual size in mm and/or the diamond equivalent in carats.