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A 6.01-carat cushion-cut fancy vivid blue diamond and a 9.27 carat fancy vivid pink emerald-cut diamond ring--auctioned at Sotheby's HK in October 2011. (The pink, top lot, did not sell that evening) http://www.pricescope.com/blog/fancy-vivid-blue-and-orange-diamonds-set-records-sothebys-sale

This handout photo released by Sotheby’s shows a Cushion-shaped Fancy Vivid Blue Diamond and Pink Diamond Ring (top) and Golconda Pink (bottom), a rare carat Golconda Fancy Vivid Pink Diamond and Diamond Ring.

Today we went to #Sothebys for the unveiling of the exquisite Blue Moon 12.03 carat #bluediamond estimated between $35-50 million. #rarediamonds #luxury

Today we went to #Sothebys for the unveiling of the exquisite Blue Moon 12.03 carat #bluediamond estimated between $35-50 million. #rarediamonds #luxury

The Royal Blue Diamond 10.06 Carats

50+ Gorgeous Blue Diamond Rings

Shop diamond, sapphire and vintage engagement rings and other antique rings from the world's best jewelry dealers.

Queen Marie of Romania’s Sapphire The 478-carat sapphire was purchased by King Ferdinand of Romania for Queen Marie in 1921. It was the largest sapphire ever offered at Christie's auction and sold for nearly 1.5 million dollars in 2003.

The 45 Most Gorgeous, Famous Gems of All Time - The Cut Queen Marie of Romania’s Sapphire The sapphire was purchased by King Ferdinand of Romania for Queen Marie in It was the largest sapphire ever offered at Christie's auction

Bulgari diamond ring set with a 3.78-carat fancy vivid blue, Image: Bonhams

Bulgari diamond and blue diamond crossover ring, Obliquely-set with a pear-shaped diamond, weighing carats and a pear-shaped fancy vivid blue diamond, weighing carats, between scrolling tapered baguette-cut diamond shoulders. 'WAY beautiful!

An Edwardian cabochon sapphire and diamond bypass ring with hand engraved decoration, in platinum. No heat Pailin sapphires, 3.23 carats. AGL certificate. Approximate total diamond weight 0.65 carats.

Edwardian Diamond and Sapphire Bypass Ring Unknown Edwardian An Edwardian cabochon sapphire and diamond bypass ring with hand engraved decoration, in platinum. No heat Pailin sapphires, carats.

Elegant Aquamarine Diamond Platinum Cocktail Ring

View this item and discover similar cocktail rings for sale at - Pastel bright and sparkly, this great aqua ring is sure to please everyone who sees it. The color is a cool and wearable icy blue, and the white of the

the Clark Pink, which set a record of 15.7 million for a 9 carat pink diamond

This is the Belle Epoque Cushion-Cut Fancy Vivid Purplish Pink Diamond Ring from the Huguette M. Clark Estate as part of the April 2012 Christie's Auction Jewelry Auction. The diamond ring has an auction estimate of 6 - 8 million dollars.

A rare 110.03 carat diamond graded 'Fancy Vivid Yellow,' the highest color grading for a yellow diamond. Valued at between 11-15 million dollars.

A rare carat diamond graded 'Fancy Vivid Yellow,' the highest color grading for a yellow diamond.

The Cullinan I (top) and Cullunan II (bottom) diamonds, which are the largest top quality cut diamonds in the world. The Cullinan I is set in the Sovereign's Sceptre with Cross, and the Cullinan II is in front of the Imperial State Crown. Weighing 3,106 carats (1.33 pounds), it was the largest diamond ever found, was discovered in the Premier Mine in South Africa in 1905. The diamond was purchased in 1907 by the Transvaal Government and presented to Edward VII as a birthday gift.

The Cullinan I (top) and Cullunan II (bottom) diamonds, which are the largest top quality cut diamonds in the world. The Cullinan I is set in the Sovereign's Sceptre with Cross, and the Cullinan II is in front of the Imperial State Crown. Weighing 3,106 carats (1.33 pounds), it was the largest diamond ever found, was discovered in the Premier Mine in South Africa in 1905. The diamond was purchased in 1907 by the Transvaal Government and presented to Edward VII as a birthday gift.