The 30-point female ring can be divided into two parts: diamond and ring support. Mainly choose the material and style of the ring holder. Personally recommend platinum. The materials of the annular support are 18K platinum, PT950 and PT900. Among them, 18K platinum is cheap, the hardest and the strongest. The disadvantage is that 18K platinum will turn yellow slightly after wearing 1 year. PT950 and PT900 represent 95% and 90% of platinum respectively, but 100% of pure metal is mostly soft, and so is platinum. Therefore, 90% PT900 is the best metal for diamond inlay, which not only has strong hardness, but also ensures the firmness of large diamonds.

The diamond grade consists of four parts: weight, color, clarity and cut. It is a comprehensive evaluation of these four parts to determine the value of diamonds.

Round diamonds have a standard cutting ratio. When this ratio is reached, the diamond can completely reflect the irradiated light, thus giving people a dazzling feeling when watching with the naked eye. On the contrary, it can't reflect light well, and it is dim, so cutting is related to whether the diamond is dazzling, so cutting is the first.

Most diamonds have flaws, which can be seen under the jeweler's magnifying glass. Truly clear diamonds are very rare, so all diamonds are divided into the following grades according to their clarity: F 1 grade: flawless; If class: the surface is flawed, but the interior is intact; VVS 1 and VVS2: very small defects; SI 1 and SI2: tiny defects; I 1, I2, I3: There are some defects.