For example, in some stores, he sells diamond rings to you, and promises that whenever he comes to the store with a product certificate, he can exchange the old ones for new ones for free, exchange them for the same price or higher, and then make up the difference, so there is no need to make up the price.

This is equivalent to a free wearing process, of course, you still have to pay for the first time.

He was calculated by the price. Now you buy a 30-cent diamond ring at a price of 10000 yuan. After two years, the same level may rise to 12000 yuan. If it is changed, it will still be 10000 yuan in the warranty.

If so, the jewelry must be real and worth buying.