Judging from your question, it doesn't look like a diamond.

If there is a diamond, the ring will be engraved with G750 Dx.xxct (such as D0.36ct), which is a 36-cent diamond.

It's just decorative stones like zircon.

G750 is 18K gold, and now the price of one gram is 160-200 yuan.

You can convert it by grams yourself, which is more accurate.

JM Mark is the abbreviation of Ji Meng Jewelry.

I hope you can be satisfied with my answer!