The most expensive diamond ever sold per carat until now was the Oppenheimer Blue diamond, which sold at a hammer price of $51.3 million and came in at 14.62 carats, or $3.5 million per carat ...

The next time, in 2022, it was with an 8.5-carat cushion-cut green diamond surrounded by two white diamonds. Bloomberg estimated the ultra-rare scene-stealer to be worth between $5 to $7 million ...

From Gwen Stefani's $500,000 sparkler to Mariah Carey's 35-carat emerald-cut diamond, here are the most expensive celebrity engagement rings ever.

The current record for the most expensive diamond or any gemstone sold at auction is held by the CTF Pink Star, a 59.60-carat oval mixed-cut diamond auctioned at Sotheby’s Hong Kong in April ...

An unidentified buyer paid CHF 39,505 million (US$43.8 million) for the pear-shaped Bleu Royal, as the gem is known, placing it among five most expensive fancy blue diamonds sold at auction.

Geneva — An exceptionally rare blue diamond went under the hammer in Geneva Tuesday, selling for almost $44 million, making it one of the most expensive diamonds ever sold at auction, Christie's ...

From Scarlett Johansson's unique $400,000 pear-shaped diamond to Beyoncé's $5 million emerald-cut sparkler, here are some of the most enormous celebrity engagement rings of all time. 01 of 17 ...