The ring. (Christie's Images LTD) 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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