At present, there are many businesses of individual tailors, most of which are self-employed, with mixed fish and dragons and mixed quality. Some merchants can be screened according to whether the other party has a business license, whether there is a physical store offline, and whether there is a double certificate for diamonds. I also suggest that I know about diamond 4C to prevent being fooled.
: 4C diamond
"4C" is a measure to judge the value and quality of a diamond. The so-called "4C" is the abbreviation of four English words beginning with C, which refers to the carat, clarity, color and cut of a diamond. As long as you synthesize the four points of "4C", it is easy to understand the value and quality of a diamond. Diamond price = weight+color+clarity+cut.
References:
Baidu Encyclopedia-Diamond 4C