About Sylvain Goldberg

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So far Sylvain Goldberg has created 109 blog entries.

Clarifying What Makes a Diamond

Diamonds have fascinated generations with their natural origin, beauty, durability and value: finite, billion-year old gemstones. More than just chemicals, diamonds involve preciousness, authenticity and heritage. Just as one cannot compare an original painting to a reproduction, one cannot compare a diamond to a manufactured replica.

Blue Diamond Sells for $15M at Sotheby’s New York

Sotheby’s sold $54 million worth of jewelry at its New York auction on Tuesday as several pieces containing rare blue diamonds and gemstones yielded higher-than-expected prices.

Black Friday sees Online Sales Surge

Online spending hit record levels on Black Friday, while robust sales at brick-and-mortar retailers indicated the shopping bonanza’s traditional side is not dead yet.

Debmarine Splashes $142M on Diamond Ship

De Beers is planning to add the world’s largest custom-built diamond-mining vessel to its fleet at a cost of $142 million.

Largest Round Diamond Ever at Auction

On Dec. 17 in New York City, Sotheby’s will offer what it calls the largest round diamond ever sold at auction—and at 110.92 carats, it’s hard to argue.

Belgium Sees Jump in Polished Diamonds Exports

Belgium’s polished diamonds exports grew in October, according to data the Antwerp World Diamond Centre (AWDC) released this week.

Grand Mazarin – Diamond in the crown

On 14 November in Geneva, one of France’s most storied gems comes to auction at Christie’s. Here we look back on the singular history of the Grand Mazarin, a diamond with three centuries of royal provenance.

Alrosa Finds 34ct. Yellow Diamond

Alrosa has recovered a 34.17-carat fancy vivid yellow rough diamond in northeastern Russia, the miner’s largest fancy-colored stone this year.

Why high-end jewelers are investing in rough diamonds

High-end jewelers are traditionally at the tail end of the diamond supply chain. Once they’re extracted, rough stones are typically acquired by specialist diamond cutters and polishers, who analyze each stone — sometimes for up to a year — to determine the ideal cut in which to shape them. Only after this process are the polished gems usually presented to high jewelry houses, who set them into glittering creations. But now a handful of houses are keen to master all stages of a stone’s journey from rough to final jewel. Last month, for example, British luxury jewelers Graff Diamonds bought the uncut Lesedi La Rona, the world’s second largest diamond, for $53 million.