How to calculate the old change in the old change

The gold I bought at the department store last year is about 368 per grams, about 3 grams, and the new 4g ring is changed to the old. Now the gold is about 280 grams.

Identify the price of Lao Fengxiang’s 18K gold diamond ring.

Material purity AU750 Material quality 2.32g total mass 2.3537g color level F-G clarity level VS price is 6370 yuan. More than 5,800 when buying. I don’t know if it is expensive, is it good or diamond? Come here.