You can also use 1 14 to check whether there is a local jewelry appraisal institution that can issue certificates (only the institution that can issue certificates is the authoritative jewelry appraisal institution). If there is, you can pay dozens of dollars at home to find it. Nanchang is a large and medium-sized city, and there should be inspection institutions in the local area. But Chow Tai Fook's jewelry should not be fake, after all, the profit of brand jewelry is already super high. There is no need to cheat in this respect.
As for the quality of diamonds:
Look at the certificate:
Colors D, E, F, (best) G H I J (medium) H ... (poor) The more letters before, the better.
Clarity: if/flawless under the microscope, VVS/ extremely defective, VS/ defective, SI/ defective, P/ unclean, above VS is acceptable, of course, the cleaner the better, below SI has no collection value.
Cut EX/ perfect VG/ good G/ good at least reach VG,
Size:
There is no score below 20 points, and perfection is of little value. There must be at least 40 diamonds preserved in China, and the most valuable diamonds are above 1 carat.