If there is a master in the shop, ten minutes is normal. There are many styles of diamonds, and rings are usually changed.

Let's put it simply. It is impossible to prepare a style of goods with n different circles and then exchange them for yours. How many goods do merchants need to prepare and how much money do they need to invest?

One certificate corresponds to one product, not to n pieces.

The diamond ring is scored. We can see if it's the same.