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Largest colorless diamond to hit the auction block sells for record price

  • A necklace featuring a giant 163.41-carat colorless diamond sold for $33.7 million at auction.
  • The diamond was the largest of its kind.
  • It broke a record for the most expensive D color flawless diamond ever sold at auction, surpassing the prior record by more than $3 million.

A necklace featuring a giant 163.41-carat colorless diamond — the world's largest of its kind — sold for $33.7 million at auction Tuesday.

It broke a record for the most expensive D color flawless diamond ever sold at auction, surpassing the prior record by more than $3 million.

Christie's sold the asymmetrical necklace, studded with emeralds and diamonds, at the Magnificent Jewels auction at the Four Seasons Hotel des Bergues in Geneva on Nov. 14.

Source: Christie's

Eighteen emerald-cut diamonds adorn one side of the necklace, while emeralds decorate the other. Its centerpiece is the colorless diamond: a D color, IIA type diamond — the rarest and most valuable kind.

"It goes perfectly — the main stone with the necklace, it looks like just a beautiful piece," said Fawaz Gruosi, the founder of de Grisogono, the Swiss luxury jeweler that created the unique necklace.

According to Christie's, the emeralds are a key part of Gruosi's collections because he believes that green symbolizes good luck. It took a team of 14 craftsmen working for over 1,700 hours to create the masterpiece.

"It's 50 carats larger than the last one of its kind," said Rahul Kadakia, international head of jewelry at Christie's. "It's completely flawless."

The necklace was sold as part of a partnership between Christie's and de Grisogono called "The Art of de GRISOGONO."

Source: Christie's

The prior record for the most expensive colorless diamond to sell at auction was an unmounted oval-cut diamond that sold in 2013 for $30.6 million in Hong Kong.

The Christie's Geneva November series attracted more than 4,600 visitors to the Four Seasons Hotel des Bergues. Their sales for this auction series totaled $144.9 million, bringing the Christie's Geneva 2017 auctions total sales to nearly $258.6 million.

For more record-breaking rocks, check out CNBC's "Secret Lives of the Super Rich."

Watch an all new episode of "Secret Lives of the Super Rich" Thursday at 10 p.m. ET/PT on CNBC.