Color: the color of top diamonds is white, that is, D-class, and the later the color becomes yellow. D-F is colorless, G-J is almost colorless, and there is basically no collection significance from K down.

2 Clarity: Clarity refers to the inclusion of a diamond, which is called the birthmark of the diamond and is a unique natural mark of the diamond itself. It is also very rare that the FL diamond with the highest clarity has no internal defects. Generally, diamonds above grade SI2 are high-quality diamonds.

3 Weight: This is what we often call carat. One carat is equal to 0.2g Other things being equal, the greater the weight of a diamond, the higher its value. One carat is divided into 100 parts, and one part is one point, so there are diamonds with 20 points, 30 points and 50 points.

Cutting: Cutting gives the diamond a second life, which is an important factor to determine the optical properties and appearance of the diamond. Only through manual cutting and carving can diamonds be presented to us beautifully. Cut too shallow and too deep, and the light can only leak out from the bottom. Only when the diamond is cut to a proper proportion can the light refract back from the top to form a shining color. Its grades are divided into EX, VG, GD, general and poor from big to small. Fair grades and above are called high-quality diamonds.