GIA, IGI, there are many certificates of national inspection, all of which are more reliable.
The landlord's certificate shows that the color and clarity grade are completely normal, because it is 18 points, that is, 0. 18 carats, 1 carat = 100 points =0.2 grams, and diamonds below 20 points belong to broken diamonds. These data and certificates shall not be issued unless there are special requirements.
Landlord, diamonds under 20 cents are of great significance as decoration and have no function of preserving value. Besides, the broken diamonds below 20 points can be sold to you at a high price. After all, it is a gem, but the actual price is low. It is estimated that 18 is only about 1000, and will not exceed 1500.
Evaluation of diamonds: Regarding color, the highest grade is D, followed by EFGH. After I-J, the color of diamonds basically began to turn yellow. Generally speaking, I think FGH grade can be considered, which is ideal; In terms of clarity, LC thinks it is flawless, followed by VVS, and then VS, SI and P diamonds are rarely used. I personally recommend VVS and VS diamonds. Generally, the cutting is good or very good, that is, VG and EX.
Landlord, 30 points, clarity VS, color GH, cutting, 5000~5000 should also be available.
In addition, what is the material of the ring bracket? If it is platinum, then one gram of PT950 is about 445, one gram of PT900 is about 420, and one gram of 18K gold is about 180.