Weight range: the weight range of diamonds. According to the diamond size you choose, find the right weight range and use the international diamond quotation correctly.
Color interval: the color interval of diamonds. According to the diamond color you choose, find the corresponding color value. The highest color scale of the quotation is D grade, and the lowest is M grade, with a difference of ten grades.
Price index: the price index range of diamonds. According to the color and clarity of the diamond you choose, find the corresponding diamond index value. The unit of the diamond index is one hundred dollars. (Calculation formula: diamond price = price index X 100X diamond weight (unit: carat) x exchange rate of USD against RMB. )
Calculation of diamond value: Take a diamond with 3 1, H color and VVS 1 as an example. Select the quotation with the weight range of 0.30-0.39CT, the color is H, and the clarity is VVS 1. The number corresponding to the two indicators is the international standard price of this loose diamond with the unit of 1 carat. 24 is the price in the unit of one hundred dollars, which is equivalent to 2,400 dollars. This number is multiplied by the number of carats of the original diamond you choose, which is its dollar quotation of 0.3 1CT. Then, you can get its RMB price as long as you calculate it according to the foreign exchange rate at that time. Its price is: 24 times 100 USD times 0.3 1CT times 6.56, which is equal to 4880.64 RMB.