How much do pawn shops pay for a 2 carat diamond ring?

The pawn shop willing to buy the ring is the only one that can tell you what the shop can pay.

If you have such a ring, best practices dictate that you pay a gemologist to evaluate the quality of the diamond and the metal, so that you have an idea of the fair market value of the ring before you go to the pawn shop. For example, today on Blue Nile you can pay US$9,369 or up to US$96,161 for a round cut, two-carat diamond, depending on its colour, cut, clarity and exact carat weight.