You can easily buy diamond jewelry if you know the four C's of cut, clarity, and color, carat weight. These qualities are important to find fine jewelry.
Cut: This refers to the way that a diamond has been cut by a diamond cutter. It affects how light reflects from the stone. There are four types of "cut", Ideal, Fine, Shallow and Deep. Do not confuse cut with shape.
This refers to the overall appearance of the diamond, including Round Brilliant, Cushion Cut, and Cushion Cut, Princess Cuts, Emerald Cuts, Radiant Cut.
Clarity refers to the presence of inclusions or blemishes within the stone. Blemishes refer to surface flaws. Inclusions are internal flaws. All flaws can be called "inclusions" for grading diamonds.
In order of highest to lowest quality, the different clarity grades are F, IF VVS1, VVS2, VS1, VS2, SI1, I2, and II.
Color: This refers to the presence of or absence of color in white (clear), diamonds. The rarest and most beautiful are colorless diamonds. They transmit the most light and are also the rarest. These diamonds are also the most expensive. The alphabetic scale for color in white diamonds ranges from D to Z. D is completely colorless. Diamonds rated from D to I have no visible color to the human eye.
Carat Weight: This refers to the size of the diamond. If all other factors are equal, larger diamonds will be more valuable. One carat equals 0.2 grams.