The goods you bought have a domestic certificate, but now the domestic certificates are all like this. In terms of cut grade, only the cut range that all diamonds should have is given, not a specific value. The cut grade you mentioned above is the specific value and grade of each diamond, which can only be given by international certificates such as GIA.

You don't have to discuss it with the store you bought, as long as the diamond is real. But according to your certificate, the color is k-l and the clarity is vvs. This kind of diamond has a low cost performance, because the clarity vvs is high, but no one can see it, but the color of k-l is very low, which is also an indicator that we can easily distinguish with the naked eye. It is common in the market at present. Not ideal.