Kris Humphries will be auctioning off the last remnant of his 72-day marriage to Kim Kardashian, her 20-carat engagement ring, though it will likely sell for far less than he bought it for, US Weekly reports.

Kardashian's giant engagement ring was reportedly purchased by the NBA star for a whopping $2 million, but now the ring is currently being listed for an Oct. 15 sale at Christie's auction house in New York City. Though Humphries is not named "explicitly" as the seller, a source close to Kardashian tells US Weekly they are "100 percent" certain it is the same ring that he used to pop the question back in 2011.

"Kim has been waiting for the day he would auction it," said the source. "Everyone always asked what Kim did with the ring - she silently gave it back over a year ago! And Kris waited until the divorce was final to sell it."

Another source dished to US Weekly that the ring is "definitely not worth $2 million, not even half of that," noting that Kardashian purchased the giant gem herself. 

And even though it's been two years since her brief marriage to Humphries, Kardashian's ring will likely still generate buzz in the auctioning circles, as bidders battle over who gets to own the Lorraine Schwartz creation "with a 16.21-carat center diamond and two 1.80-carat side diamonds," expected to sell between $300,000 and $500,000.

Despite the loss of the giant ring, as US Weekly writes, Kardashian now has something far more: an adorable daughter, North, whom she had with her doting boyfriend, Kanye West. The couple were recently photographed inspecting the construction on their $11 million mansion in the exclusive Bel Air, Calif. gated community.