Rare diamond

What does a 1 carat diamond look like? How about a 5 carat diamond? See what different diamond carat sizes really look like with our visual guide—and learn why the number of carats shouldn't be the top factor for choosing a great stone for an engagement ring.

Timed to coincide with the 40th-anniversary celebrations of Sotheby’s operations in Asia, the auction house announced in August 2013, the sale of two extremely rare diamonds at its Magnificent Jewels and Jadeite Autumn Sale 2013, coming up on October 7, 2013, at the Hong Kong Convention and Exhibition Center. One of these diamonds bearing Lot [...]

By Erika Winters 122.52-carat blue diamond recovered at the Cullinan mine Petra Diamonds announced the recovery of a 122.52-carat blue diamond at the Cullinan mine in South Africa. The diamond […]

Revisit the Farnese Blue, the Blue Moon of Josephine, Mrs. Paul Mellon's blue and more memorable blue diamonds at Sotheby's.

The 102.34 carat rock, cut from a stone mined in Botswana, has been hailed as the 'rarest white diamond' ever to come to market. It is on display at Sotheby's Diamonds in London.

1. THE ZOE DIAMOND – $32,645,000 (OR $3,348,205 PER CARAT) A 9.75-carat Fancy Vivid Blue diamond from the Collection of Mrs. Paul Mellon (Photo courtesy of Sotheby’s) The Zoe diamond set a new worl…

Fancy color diamonds are graded in two ways. The first factor considered is the stone's basic hue, such as pink, yellow, blue, green, etc. The second is the diamond's intensity. Both color characteristics form the basis for determining a fancy colored diamond's worth.

By Erika Winters An 8.41-carat fancy vivid purple-pink diamond is expected to fetch between $12.8 and $15.4 million at Sotheby’s Hong Kong. Image: Sotheby’s Sotheby’s Hong Kong will be auctioning […]

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