Kim Kardashian To Pay Kris Humphries For Engagement Ring?

Sources close to the former couple tell us ... it was Kris who originally bought the 20.5 carat diamond stunner ... and Kim loved the ring so much, she included a clause in the pre-nup which allows her buy the ring from Kris for the original purchase price in the case of a divorce.

Since the couple is now kaput -- the diamond is in Kim's court. We're told KK still LOVES the ring -- and will pay Kris so she can keep it.