09 avril 2017

Petrified wood, Australian gold nugget, gemstones and meteorites highlight Heritage Auctions sale

DALLAS, TX.- Samples of rare Petrified Wood will be among the most coveted lots at Heritage Auctions' Nature & Science Auction April 29-30 in Dallas.  The Petrified Wood comes from the collection of Lewis Goodman, a successful financier who turned a 1980s visit to a Colorado gift shop into a lifetime spent collecting petrified wood and agates. "The Lewis Goodman collection features some exceptional samples of Petrified Wood, some of the finest we have ever seen," Heritage Auctions Nature & Science Director... [Lire la suite]

19 mai 2016

Large and Impressive Tanzanite, Tanzania

Lot 1273. Large and Impressive Tanzanite, Tanzania. Weighing approximately 92.60 carats and measuring 31.90 x 22.58 x 16.10mm. Sold for US$ 37,500 (€33,491). Photo: Bonhams. This fine oval-cut stone has an exceptional saturation of blue-violet. Both its luster and clarity are excellent. Most tanzanites typically commercially available in the market range in size from 1 to 3 carats and are pale in color. The present example is of a wearable size as an impressive pendant and displays an exemplary hue: a rich... [Lire la suite]
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23 avril 2016

Tiffany & Co. L’Art de la Transformation: Tanzanite, Aigue Marine et Tourmaline verte.

Tiffany & Co. Bague Dôme en tanzanite.  D’élégantes rangées de diamants et de saphirs épousent une tanzanite luxuriante, tout en saisissant la beauté changeante de la nature dont les couleurs et les formes évoluent sans cesse. Convoitée pour sa profonde couleur bleu-violet et découverte au pied du mont Kilimandjaro en Afrique de l’est, la tanzanite fut la première pierre bleu transparent trouvée depuis plusieurs centaines d’années. Tiffany & Co. Collier Goutte.... [Lire la suite]
03 décembre 2015

Kaminski Auctions December 13th Holiday Sale to feature Jewelry from the Estate of Ruth L. Harris

18K white gold, coral and diamond necklace and bracelet. EST: $20 000 - $25 000 BEVERLY, MASS.- Kaminski Auctions December 13th Holiday Auction presents an impressive array of fine jewelry including estate pieces from the collection of Ruth L. Harris of Boston, Massachusetts, just in time for Christmas. The star lot of the sale is an eighteen carat gold bracelet and necklace set, with coral and diamonds. The necklace having 3.64 carats of diamond and 166.7 grams of coral is from a New York collection. There... [Lire la suite]
07 octobre 2015


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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19 mars 2015

Mikimoto Hyacinthia earrings

Mikimoto Hyacinthia earrings with baroque South Sea cultured pearls, tanzanite and diamonds. Baselworld 2015, 19 - 26 mars 2015

12 août 2014

Tanzanite jewellery

Tiffany Peacock pendant featuring diamonds, aquamarines and a central tanzanite. Tiffany Anniversary platinum necklace, set with over 175ct of tanzanites, complemented by a cascade of round brilliant diamonds. Tiffany Anniversary platinum ring with a 9.99ct tanzanite and diamonds. Arunashi handmade reverse tanzanite ring with diamonds. Available at Ylang23.com. Available at Ylang23.com, Arunashi's white gold ring features a total of 29ct of inverted tanzanite stones scattered amongst 4.36ct of diamonds. Chopard... [Lire la suite]
22 janvier 2014

Martin Katz jewelry

  Martin Katz Pavé Teardrop & Rose-Cut Drop Earrings set in 18K white gold; 18 round rose-cut diamonds weighing 1.95 carats and microset with 128 diamonds weighing 1.04 carats. Photo courtesy of Martin Katz. Martin Katz Australian Black Opal and Diamond Ring. Photo courtesy of Martin Katz A rare Australian black opal of 8.01 carats, surrounded by a border of micro-set white diamonds, amethysts and tsavorites. Set in 18K white gold.  Martin Katz Round Emerald Cabochon and Diamond Drop Earrings. Photo... [Lire la suite]
29 décembre 2013

Tanzanite, Fluorite, Calcite, Stolzite, Apophyllite, Quartz, Stilbite

Apophyllite over Quartz and Stilbite Stolzite Fluorite, Calcite // Elmwood Mine, Smith County, Tennessee, USA Tanzanite Natural Gem Crystal.
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02 octobre 2013

Very fine gemstone: large Tanzanite - 61.43 ct. Merelani Hills, Umba Valley, Lelatema Mountains, Arusha Region, Tanzania

Very fine gemstone: large Tanzanite - 61.43 ct. Merelani Hills, Umba Valley, Lelatema Mountains, Arusha Region, Tanzania. Photo courtesy Heritage Auctions Luscious is a term that comes to mind when looking at this Tanzanite. Other superlatives might be big or huge. At 61.43 carats this is a very impressive gemstone with excellent color: it has the rich blue hue with just a hint of purple that Tanzanite is renown for. When examined this stone exhibited flashes of red, so it would be a fair assumption that it has not been heat... [Lire la suite]
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