Kim Kardashian’s ex-husband, basketball player Kris Humphries, has auctioned off her 20-carat diamond engagement ring.

Kris, who split from the Keeping up with the Kardashians star after just 72 days of marriage in October 2011 ‒ sold the ring he gave to his ex-wife for $620 000 (R6,2 million) at Christie’s auction house in New York City yesterday.

The anonymous buyer will pay a total of $749 000 (R7,49 million) for the ring after Christie’s mark-up fees.

Bidding opened at $200 000 (R2 million) for the Lorraine Schwartz creation, which features a 16.21-carat centre diamond between two 1.8-carat diamonds, according to UsMagazine.com.

The auction catalogue stated a portion of the sales price would be donated to an unidentified charity.

The ring was originally expected to fetch between $300 000 (R3 million) and $500 000 (R5 million) but the sum is a far cry from the $2 million (R20 million) the ring was said to be worth when Kris (28) proposed to Kim in May 2011.