My experience tells me that anyone, no matter what diamond ornaments they buy, must have a certificate. If you have a certificate, it will be more expensive at most. If there is no certificate, there are two points: 1 The diamond grade is not enough or too small; 2 is fake. Generally speaking, diamond ornaments are priced by piece. The same diamond, different grades and scores, the price may vary greatly. I don't know what you mean by "Jin Jiali diamond"! It's not slander, but maybe imitation diamond jewelry (I've heard of it, I'm not sure).