The international unit of weight used for measuring diamond and gemstones, 1 carat is equal to 0.2 grams. Use below guide to estimate the size of your diamond.
The scale below illustrates the size of a 0.900000 diamond. Remember that while the measurements below are typical, every diamond is unique.
D colored diamonds are the rarest and totally colorless. Also the most valuable.
SI1 The inclusions in this diamond can be visible at 10x power magnification. Inclusions in diamonds with SI grade clarity might be visible to the unaided eye. SI1 grade diamonds are not as rare as VS1 and VS2 grade diamonds, so they are less expensive and present a great value.