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Logan Sapphire, the second largest (blue) sapphire known, weighing 422.99 carats (84.6 g). On display at the Natural History Museum in Washington DC.

Logan Sapphire, second largest (blue) sapphire known, weighing carats. Natural History Museum in Washington DC.

The Logan Sapphire Originally from Sri Lanka, this 423-carat violet blue sapphire is roughly the size of an egg. It belonged to a Washington, D.C., socialite, Mrs. Polly Logan, who donated the stone to the Smithsonian’s collection in 1960.

The Logan Sapphire

The Logan Sapphire Flawless sapphire is the second largest known one in the world, a staggering carats. The cushion-cut stone is one of the world's largest and most famous sapphires, set in a brooch surrounded by 20 round-cut diamonds weighing 16 carats.

Hope Diamond ($250 million). Among the most romanticized jewels in the world, the Hope Diamond is housed at the Smithsonian's National Museum of Natural History and considered the second-most visited piece of art in the world (behind the "Mona Lisa"). Discovered in India in 1812, the 45.52-carat blue-gray stone has had many owners over the years. The diamond is also said to be cursed—including the alleged suicides of several of its owners.  Selected by http://sleepbamboo.com/

World's Most Expensive Colored Diamonds

The Hope Diamond - photo by Chip Clark // putting this in 'Clothing and Accessories' I thought might be a bit pretentious.

Marie Antoinette's faberge sapphire imperial ring

Marie Antoinette's (or Monika Anna) Faberge Sapphire imperial ring I think they got this back wards. It is a Antoinette Marie sapphire imperial ring.

Blue Chalcedony, Sapphire, Diamond 18K White Gold Ring, Asprey

A Chalcedony, Sapphire and Diamond ring, Asprey, centering a blue Chalcedony cabochon measuring approximately x x surrounded by round brilliant-cut Diamonds, further accentuated by oval and circular-cut blue Sapphires;

Art Deco 4.10CT Royale Blue Sapphire Engagement Wedding 925 Sterling Silver Ring #Splendidmerchants #SolitairewithAccents

Art Deco 4.10CT Royale Blue Sapphire Engagement Wedding 925 Sterling Silver Ring

Important and impressive platinum, diamond and natural sapphire cocktail ring, circa It features a vibrant blue oval natural Burma sapphire central stone measuring total weight.

15 carat blue star sapphire and diamond Art Deco ring at Lang Antiques. Circa 1930.

КИНО И ОБРАЗ 15 carat blue star sapphire and diamond Art Deco ring at Lang Antiques.

Blue Belle of Asia almost 400 ct Sri Lanka Christies November 2014..expected to reach more than 7M €: via Adolfo de Basilio - Madrid

Nice necklace Blue Belle of Asia almost 400 ct Sri Lanka Christies November to reach more than €: via Adolfo de Basilio

SAPPHIRE AND DIAMOND RING, OSCAR HEYMAN & BROTHERS. Claw-set with a cushion-shaped sapphire weighing 17.84 carats, within a line of pear-shaped diamonds, further decorated with brilliant-cut stones, mounted in yellow gold and platinum by BLOOMS68

SAPPHIRE AND DIAMOND RING, OSCAR HEYMAN & BROTHERS. Claw-set with a cushion-shaped sapphire weighing carats, within a line of pear-shaped diamonds, further decorated with brilliant-cut stones, mounted in yellow gold and platinum

Extremely rare and valuable emerald in an Art Deco ring. Made by Cartier Paris, in 1925. The emerald weighs 18.62 carats and is surrounded by 5.02 carats of diamonds. The ring is worth $1,500,000 and was auctioned by Christie's on January 15, 2014

Extremely rare and valuable emerald in an Art Deco ring. Made by Cartier Paris, in The emerald weighs carats and is surrounded by carats of diamonds. The ring will be auctioned by Christies on January 2014

A necklace is set with a rare esteemed Montana sapphire, 5 carats, and embellished with carved Montana sapphires and diamonds in platinum.

The Art of the Sea: Blue Tourmaline Scales Ring

The 2013 Tiffany Blue Book / A necklace is set with a rare esteemed Montana sapphire, 5 carats, and embellished with carved Montana sapphires and diamonds in platinum.

Canary diamond; part of the Gem and Mineral Collection of the Smithsonian's National Museum of Natural History.

Smithsonian Canary Diamond A spectacular, Sparkling and Rare Yellow "Canary" Diamond, mounted in a Ring is part of the Gem and Mineral Collection of the Smithsonian's National Museum of Natural History.

The Bismarck Sapphire by deborah

Sapphire Necklaces The Bismarck Sapphire. The necklace is named after its donor, Countess Mona von Bismarck, an American socialite who