The ring. (Christie’s Images LTD)

Guess Kris Humphries kept the ring. Kim Kardashian’s ex capped the reality couple’s divorce (finalized in June) by auctioning off the 20.5-carat diamond stunner he used to pop the question. The winning bid? $749,000, auctioned by Christie’s in New York Tuesday. The Lorraine Schwartz creation — rectangular-cut diamond flanked on either size by a trapeze-cut jewels — was originally reportedly valued at $2 million. “We were pleased with the sale overall,” a Christie’s rep told us, confirming that a phone bidder got the ring at the fire sale — and said a portion of the sale is going to charity.

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