First: If you bought it in their store and want to sell it back to them now, I suggest you keep it as a souvenir. If they must be recycled, the current price is X30%. You can't stand it, but it will be lower.

Second: Never, never trust the discount of diamond jewelry store.

Third: it is best to find a personal tailor to buy diamond ornaments. You can make any style you can see, and the price will not be expensive. What you are worried about is whether it is true or not. You can guarantee GIA's international authority certificate (for diamonds with a score of more than 30, only those with a score of more than 30 can be tested internationally, and those with a score of less than 30 can only show the national inspection, and if they are too small, there is no way), and the special ID card of each diamond can be checked online, or you can go to a local jewelry appraisal office for appraisal.