The Lorraine Schwartz diamond and platinum ring was sold during the Christie's New York Magnificent Jewels auction on Tuesday for $US759,000 ($786,862).
Kim reportedly spent $2 million US buckaroos on her 20.5 carat piece in 2011. But according to Us Weekly it only had an opening bid of $US200,000 ($210,130) at the auction. That's a pretty heft reduction!
It's an even bigger reduction than Hugh Hefner's wife Crystal Hefner got for her 3.39 carat ring worth $US90,000 (AUD$87,938) from their first engagement. Which sold for nearly half the price at a mere $US47,500 ($46,412). Ouch!
In contrast, Elizabeth Taylor's infamous 33.19 carat Krupp diamond ring from sixth hubby Richard Burton, estimated at $US2.5 million ($2.6 million), sold at auction for $US8.8 million ($9.24 million).
Gawk at more dazzling rings of the stars in our celeb engagements and wedding rings gallery below...
Wide World of Sports
Latest celebrity news
Fat Tony & Co
The Big Bang Theory
2 Broke Girls
Two and a Half Men
House & Garden