06 décembre 2015

AGTA Spectrum’s Cutting Edge Awards for 2015

The AGTA Cutting Edge Awards honor excellence and creativity of the lapidary arts, including natural colored gemstones and cultured pearls, carvings, other gem materials and objects of art in U.S. and Canada. A panel of judges will evaluate entries in the Cutting Edge Awards.The purpose of the Cutting Edge Competition is to celebrate the excellence and creativity of lapidary artists and colored gemstones.  Entries may incorporate existing lapidary techniques; however entries in Pairs & Suites, Innovative Faceting, Carving... [Lire la suite]
17 novembre 2015

Bright Orange Non-Nacreous Melo Pearl, Melo melo, Saltwaters near Vietnam

Bright Orange Non-Nacreous Melo Pearl, Melo melo , Saltwaters near Vietnam. Estimate US$ 25,000 - 30,000 (€23,000 - 28,000). Photo Bonhams. Relatively unknown in the West, even George Kunz's compendium of 1908, The Book of The Pearl, had no references to the rare orange pearl offered here. So few have been found, it is no wonder. The Melo melo is the marine snail that produces orange pearls the color of a ripe papaya. The snail generates a pearl-like substance to enclose foreign bodies, or irritants,... [Lire la suite]
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14 novembre 2015

Rare Black Opal--"Mackerel or Ribbon Pattern", Lightning Ridge, New South Wales, Australia

Rare Black Opal, "Mackerel or Ribbon Pattern", Lightning Ridge, New South Wales, Australia. Estimate US$ 40,000 - 50,000 '€37,000 - 46,000). Photo Bonhams. A beautiful opal either by night or day, the present stone is particularly notable for its mackerel pattern, the name for the ribbon pattern of opalization which is so sought-after by knowledgeable opal collectors. Displaying extensive orange ribbons with some flashes of red, when the stone is rotated, iridescent green flashes abound, intermingled with some... [Lire la suite]
13 novembre 2015

Spectacular Black Opal, Corcoran Opal Field, Lightning Ridge, Australia

Spectacular Black Opal, Corcoran Opal Field, Lightning Ridge, Australia. Estimate US$ 40,000 - 50,000 '€37,000 - 46,000). Photo Bonhams. A classic for the region, predominating in firey reds and full vividness of its multi-color play-of-color. This gem possess true black potch as well as some play-of-color to the reverse side as well. Weighing approximately 8.14 carats and measuring 18.98 x 12.83 x 5.08mm Bonhams. THE WORLD OF OPALS, 23 Nov 2015 15:00 PST - LOS ANGELES
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13 novembre 2015

Superb Contra Luz Fire Opal. A Published Gemstone, Magdelena, Jalisco, Mexico

Superb Contra Luz Fire Opal. A Published Gemstone, Magdelena, Jalisco, Mexico. Estimate US$ 40,000 - 50,000 '€37,000 - 46,000). Photo Bonhams. Perhaps the finest contra luz opal to appear at public auction, the present example has been contour polished to follow the lines of the original rough to fully reveal its inner beauty. A deep, rich mandarin orange in body color, the spectral colors appear in bands of green, yellow, orange and crimson red--completely reminiscent of an aurora borealis phenomenon. This is an... [Lire la suite]
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13 novembre 2015

Spectacular Black Opal, Lightning Ridge, New South Wales, Australia

Spectacular Black Opal, Lightning Ridge, New South Wales, Australia. Estimate US$ 50,000 - 70,000 (€46,000 - 65,000). Photo Bonhams. A thick, plump and delectable specimen of opal fashioned as a high-domed cabochon. Dominated by reddish-orange flashes of color, interspersed with electric blue and purple and splashes of green. With some play-of-color on the reverse, the stone retains some semi-black potch to the reverse as well which enhances the vibrancy of the colors.Weighing approximately 47.15 carats and measuring... [Lire la suite]
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13 novembre 2015

Guinness Book of World Records: Largest Recorded Black Opal Specime. "The Sea of Opal"

Guinness Book of World Records: Largest Recorded Black Opal Specimen--"The Sea of Opal", Joe's Run, Grawin Field, near Lightning Ridge, New South Wales, Australia. Carved and polished by Christine Rousel. Estimate US$ 150,000 - 250,000 (€140,000 - 230,000). Photo Bonhams. Found over 10 years ago in Grawin Field, the present specimen of seam opal was left as close as possible to the natural state in which it was found. Cut and polished by the artist who was then Australia's foremost opal carver, the late... [Lire la suite]
13 novembre 2015

Premier American collection
of twelve lightning ridge black opals, Lightning Ridge, New South Wales, Australia

Premier American collection
of twelve lightning ridge black opals, Lightning Ridge, New South Wales, Australia . Estimate US$ 600,000 - 800,000 (€560,000 - 740,000). Photo Bonhams. Comprising a free-form black opal, weighing approximately 11.07 carats; an oval black opal, weighing approximately 12.12 carats; an oval black opal, weighing approximately 13.0 carats; a free-form semi-black, weighing approximately 14.0 carats; a free-form black opal, weighing approximately 14.12 carats, an oval black opal, weighing... [Lire la suite]
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12 novembre 2015

World's Largest Meteorite Carving Offered At Bonhams Auction

Unique Life-sized Skull-form Carving of a Gibeon Meteorite with Tridymite Inclusion By Lee Downey. Iron, Fine Octahedrite, Namibia, Africa. Weighing approximately 21,070 grams (21.07 kilos, 46.45 lbs). Estimate on request. Photo: Bonhams. LOS ANGELES – The first skull to be carved out of one of the rarest materials on Earth will be offered in Bonhams' Lapidary Works of Art, Gemstones and Minerals auction on November 24 at Bonhams, Los Angeles. A life-size model of a male skull and the world's largest known meteorite... [Lire la suite]
07 octobre 2015

Tanzanite

Tanzanite is trichroic and exhibits pronounced pleochroism. The colors respective to the three vibrational directions are sapphire-blue, sage green, and purple. Orientation is an important consideration for cutters who need to consider both the yield and the resulting color. And because of their similarity in color, comparisons between tanzanite and sapphire are inevitable. Natural Tanzanite Cushion, 13.190 cts Natural Tanzanite Heart, 2.470 cts Natural Tanzanite Heart, 10.990 cts Natural Tanzanite Heart,... [Lire la suite]
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