First of all, jewelry must have a quality inspection certificate issued by an authoritative organization, so as to ensure that it will not be cheated. Be sure to pay attention to whether the gem has been treated and whether the ring holder is the same as the store said.
Furthermore, the value of gems. In fact, the evaluation of gems has an evaluation standard similar to that of diamond 4C ~ ~ Let's compare the standard with the real thing, and you will have a general understanding.
For the jewelry in the store, it may be half true and half false, so keep your eyes open when you buy it.