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Eloge de l'Art par Alain Truong
14 novembre 2010

An important oval-shaped diamond ring

An important oval-shaped diamond ring
An important oval-shaped diamond ring. Photo: Christie's Images Ltd., 2010 Set with an oval-shaped diamond weighing 20.54 carats, to the triangular-shaped diamond shoulders, mounted in platinum, size 6 - Estimate CHF1,800,000 - CHF2,500,000 ($1,850,802...
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14 novembre 2010

A Magnificent Pear-shaped Golconda Diamond Necklace.

A Magnificent Pear-shaped Golconda Diamond Necklace.
A Magnificent Pear-shaped Golconda Diamond Necklace. Photo: Christie's Images Ltd., 2010 The antique pear-shaped Golconda diamond, weighing 26.17 carats, suspended from a cushion-shaped diamond weighing 1.28 carat, to the briolette diamond chain and diamond-set...
13 novembre 2010

Extraordinary Boulder Opal Cabochon. Koroit, Queensland, Australia

Extraordinary Boulder Opal Cabochon. Koroit, Queensland, Australia
Extraordinary Boulder Opal Cabochon. Koroit, Queensland, Australia © 2002-2010 Bonhams 1793 Ltd Weighing approximately 188.0 carats and measuring 70.0 x 32.0 x 12.5mm - Sold for $8,540 This is an exceptional and very large, gem-quality pear-shaped cabochon...
13 novembre 2010

Gem-Quality East African Prase Opal. Mount Iyobo, Tanzania

Gem-Quality East African Prase Opal. Mount Iyobo, Tanzania
Gem-Quality East African Prase Opal. Mount Iyobo, Tanzania © 2002-2010 Bonhams 1793 Ltd Weighing approximately 28.35 carats and measuring 22.5 x 19.0 x 11.0mm - Sold for $3,050 Both chrysoprase and prase opal have been mined on Iyobo Mountain in central...
13 novembre 2010

White Opal with Intense Fire

White Opal with Intense Fire
White Opal with Intense Fire © 2002-2010 Bonhams 1793 Ltd 570 km north of Addis Ababa, Wello (Wollo), Delanta Plateau, Tigray, Ethiopia Weighing approximately 43.47 carats and measuring 23.5 x 14.5mm - Sold for $5,795 The present stone is a substantial...
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13 novembre 2010

Hydrophane White Opal with Intense Fire. 570 km north of Addis Ababa, Wello (Wollo), Delanta Plateau, Tigray, Ethiopia

Hydrophane White Opal with Intense Fire. 570 km north of Addis Ababa, Wello (Wollo), Delanta Plateau, Tigray, Ethiopia
Hydrophane White Opal with Intense Fire. 570 km north of Addis Ababa, Wello (Wollo), Delanta Plateau, Tigray, Ethiopia © 2002-2010 Bonhams 1793 Ltd Weighing approximately 10.10 carats and measuring 21.5 x 14.0 x 7.5mm - Sold for $1,464 This is an excellent...
13 novembre 2010

Spectacular Black (Dark Brown) Nevada Opal. Royal Peacock Mine, Virgin Valley, near Denio, Nevada

Spectacular Black (Dark Brown) Nevada Opal. Royal Peacock Mine, Virgin Valley, near Denio, Nevada
Spectacular Black (Dark Brown) Nevada Opal. Royal Peacock Mine, Virgin Valley, near Denio, Nevada © 2002-2010 Bonhams 1793 Ltd Weighing 25.48 carats and measuring 19.5 x 28.0 x 7.5mm - Estimate: $10,000 - 15,000 Note: Some of the most stunning black opals...
12 novembre 2010

Historic Carved Black Opal "The Story of the Gems". Lightning Ridge, New South Wales, Australia

Historic Carved Black Opal "The Story of the Gems". Lightning Ridge, New South Wales, Australia
Historic Carved Black Opal together with the book "The Story of the Gems". Lightning Ridge, New South Wales, Australia © 2002-2010 Bonhams 1793 Ltd Weighing approximately 29.23 carats and measuring 38.0 x 15.0 x 8.0 mm. Sold for $28,060 Carved with a...
12 novembre 2010

A World-Class Gem-Quality Australian Black Opal—"The Stardust Opal". T-Bones Mine, Corcoran, New South Wales, Australia

A World-Class Gem-Quality Australian Black Opal—"The Stardust Opal". T-Bones Mine, Corcoran, New South Wales, Australia
A World-Class Gem-Quality Australian Black Opal—"The Stardust Opal". T-Bones Mine, Corcoran, Lightning Ridge, New South Wales, Australia © 2002-2010 Bonhams 1793 Ltd Weighing 14.40 carats and measuring 18.5 x 14.1 x 8.0mm. Sold for $39,650 Found in 1981,...
12 novembre 2010

Rare Boulder Opal and Diamond Necklace—"The Black Rainbow". Queensland, Australia

Rare Boulder Opal and Diamond Necklace—"The Black Rainbow". Queensland, Australia
Rare Boulder Opal and Diamond Necklace—"The Black Rainbow". Queensland, Australia © 2002-2010 Bonhams 1793 Ltd Designed and fabricated by James Currens. 2009 AGTA Spectrum Award Winner for 1st Place—Phenomenal Gemstone Category Featuring a fancy cabochon...
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