Alexandrite ring, 7.65 carats, surrounded by alexandrites, diamonds and platinum.

Alexandrite and Diamond ring. The cushion-shaped alexandrite, weighing carats, surrounded by oval cut alexandrites. Brilliant-cut diamond shoulders and gallery, mounted in platinum.

SPINEL AND DIAMOND RING, 1960S. Claw-set to the centre with an octagonal spinel weighing 8.24 carats within a surround set with marquise-shaped and baguette diamonds, size N, French assay and maker's marks.

Jewelry Diamond : Image Description SPINEL AND DIAMOND RING, Claw-set to the centre with an octagonal spinel weighing carats within a surround set with marquise-shaped and baguette diamonds, size N, French assay and maker's marks.

Cullinan III and IV Brooch

Her majesty the Queen Elizabeth II's favourite. Cullinan III and IV Brooch, Carrington & Co. Diamonds: A Jubilee Celebration. Credit line: The Royal Collection (c) Her Majesty Queen Elizabeth II Via The Jewellery Editor.

Chopard Chameleon diamond. This $10,000,000 chameleon diamond appears green in bright light but looks yellow in darkness. It is the largest chameleon diamond known to exist.

and green for me : Chopard Chameleon diamond. This chameleon diamond appears green in bright light but looks yellow in darkness. It is the largest chameleon diamond known to exist.

The Dresden Green Diamond, 49.21 carats, taken to Moscow after WWII

'The Dresden Green Diamond': green fancy, carats, pear cut - Possibly Brazil, the largest green diamond known - It was taken to Moscow after World War II.

Drawing of the ceremonial necklace for the Maharajah of Nawanagar, 1931, London Cartier Archives (c) Cartier

Drawing of the ceremonial necklace for the Maharajah of Nawanagar, London Cartier Archives. Jacques Cartier presented the Maharaja with a dazzling project.

The Cullinan III and IV brooch

The Queen wears the Cullinan V Heart brooch to London Fashion Week

The third and fourth largest stones cut from the Cullinan diamond are known as Cullinan III and Cullinan IV and can be hooked together as a brooch. In The Queen inherited the brooch and wears it regularly.

DIAMOND 'TOI ET MOI' RING, BY BULGARI   Set with two cushion-shaped diamonds, weighing approximately 4.03 and 4.01 carats, to the tapered baguette-cut diamond shoulders, mounted in platinum, ring size 6, in grey fabric Bulgari pouch  Signed Bulgari

DIAMOND RING, BY BULGARI Set with two cushion-shaped diamonds, weighing approximately and carats, to the tapered baguette-cut diamond shoulders, mounted in platinum

Mountbatten Art Deco Diamond Platinum Chain.

The Mountbatten Art Deco Diamond and Platinum Necklace. The necklace converts to a short necklace and a couple of bracelets. Formerly the property of Edwina Lady Mountbatten, sold in

35 carats of Deep Blue Perfection  The Wittelsbach Graff Diamond

wittelsbach graff, most expensive diamonds, blue diamonds, blue graff diamond

The world's most expensive diamond (and most expensive gem ever sold at auction): The Blue Moon Diamond sold for $48 million. At 12.03 carats, that's $4 million per carat!

12 Carat Blue Diamond Sold is Now the Most Expensive Diamond Ever Sold at an Auction!

diamond ring

Art Deco Antique North South Dinner Ring Cushion Old Euro Cut Diamond Solid Platinum - EraGem

Superb Antique Russian Demantoid Brooch.  Perm, the Urals, Russia,  c. 1885.

Extremely Rare 1885 carat Russian Demantoid Brooch ( was made in the city of Perm, the city in the Ural Mountains, where Russian demantoids are mined) Amazing !

Colored Diamonds at Christie's

A Cushion-Cut Fancy Vivid Blue Diamond Ring of and A Rectangular-Cut Fancy Intense Pink Diamond Ring of Photo courtesy of Christie’s

The Pink Star – a 59.60-carat oval-cut, internally flawless, type IIa, Fancy vivid Pink diamond

Pink Star (mounted) - Sotheby's Geneva - Nov 13 The Pink Star – a oval-cut, internally flawless, type IIa, Fancy vivid Pink diamond Photo courtesy of Sotheby’s

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