Christie's Auctions is famous for selling spectacular jewels. This October 15th auction in New York has a famous jewel up for grabs that will bring in a big price tag-because of it's previous owner. The engagement ring of Kim Kardashian from her failed marriage to Kris Humphries is up for auction. Although Christie's has not advertised the listing as Kim Kardashian's ring, a source told US Weekly the ring was indeed Kim's. "It is 100 percent the same ring," a source told Us Weekly. "Kim … silently gave it back over a year ago. And Kris waited until the divorce was final to sell it." All descriptions of the ring match the above ring's listing. The only current discrepancy is the estimated value. Humphries allegedly spent $2 million on the ring and the auction is only set to fetch less than a fourth of that price, $300-500 thousand. "The ring is definitely not worth $2 million, not even half of that," the source tells Us Weekly, noting that Kardashian paid for the gem herself. The ring’s listing can be seen here. Described as "impressive," it is set with a rectangular-cut diamond, weighing approximately 16.21 carats, flanked on either side by trapeze-cut diamonds, each weighing approximately 1.80 carats. It is mounted in platinum and rests in a Lorraine Schwartz pink wood case. The ring itself is a 16.21 emerald cut center stone, I color, VS1 clarity. The trap ezoid cut diamond side stones are each 1.80 carats with the setting itself a plain platinum band enscribed "L.S. for Lorraine Schwartz". The listing of the ring can be seen here.