Cartier is a signature, and it must be on all works.

N49283 is an independent number, which is unique, just like an ID card.

750 is the material mark, namely 18K gold.

Fifty-three is the size of your hand

You can't tell what style and price it is just by the inside. If convenient, you can provide a photo or more information. Judging from this independence number, this style should not be a special foundation. It may be a little expensive, but it won't be particularly expensive, because there is no carat mark of diamonds on the ring, and there may be diamonds, but that's not the point.