unusual 7-sided diamond is known as the Paragon, and weighs 137.82 carats. The Graff Diamond Co. of London cut the gem, and is its current owner.

unusual 7-sided diamond is known as the Paragon, and weighs 137.82 carats. The Graff Diamond Co. of London cut the gem, and is its current owner.

The Cullinan VIII cushion-cut 6.80 ct diamond is set in plantinum brooch with (and sometimes without) the Cullinan VI marquise-cut 11.50 ct diamond pendant.

The Cullinan VIII cushion-cut 6.80 ct diamond is set in plantinum brooch with (and sometimes without) the Cullinan VI marquise-cut 11.50 ct diamond pendant.

An early 20th century aquamarine and diamond necklace. The front composed of three delicate quatrefoil clusters, millegrain-set throughout with cushion-shaped and oval-cut aquamarines and old brilliant and single-cut diamonds, connected by similarly set single-cut diamond foliate swags, suspending a large cushion-shaped aquamarine pendant, mounted in platinum and yellow gold, on a fine trace-link chain. Via Bonhams."

An early 20th century aquamarine and diamond necklace. The front composed of three delicate quatrefoil clusters, millegrain-set throughout with cushion-shaped and oval-cut aquamarines and old brilliant and single-cut diamonds, connected by similarly set single-cut diamond foliate swags, suspending a large cushion-shaped aquamarine pendant, mounted in platinum and yellow gold, on a fine trace-link chain. Via Bonhams."

One of the most remarkable Natural Black Diamonds in the World, the 67.50 carat Black Orlov.

One of the most remarkable Natural Black Diamonds in the World, the 67.50 carat Black Orlov.

FANCY PINK DIAMOND RING.  The fancy pink pear-shaped diamond weighing 8.02 carats flanked by similarly-shaped stones, the frame and the mount set with brilliant-cut diamonds, the gallery set with similar stones of pink tints, mounted in white and rose gold,  size 51.

FANCY PINK DIAMOND RING. The fancy pink pear-shaped diamond weighing 8.02 carats flanked by similarly-shaped stones, the frame and the mount set with brilliant-cut diamonds, the gallery set with similar stones of pink tints, mounted in white and rose gold, size 51.

The Christina Onassis Diamond (38 carats) held by the Christie's director of jewellery on June 9, 2008 in London, England. The necklace is estimated to fetch 1,800,000 ? 2,200,000 GBP when it is auctioned at Christie?s Jewel sale on June 11, 2008.

Christina Onassis Diamonds Included In Christie's Auction

The Christina Onassis Diamond (38 carats) held by the Christie's director of jewellery on June 9, 2008 in London, England. The necklace is estimated to fetch 1,800,000 ? 2,200,000 GBP when it is auctioned at Christie?s Jewel sale on June 11, 2008.

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