I am currently on the lookout for a ring for the woman I love. I want to propose her to marry me. Can you please tell me what criteria should be used to choose such a piece of jewelry? What kind of jewelry should it be?

A proposal ring is usually chosen according to one's taste. If you and your beloved prefer, for example, simple rings, then take an ordinary flat ring with a small round diamond, and if you like more bright and chic jewelry, then you can choose something like this ring in futuristic style of 18-karat rose gold http://pierrejewellery.com/katalog/ring-emerald-diamond-3790r.