Colored Gemstones

【Brazil】Interesting Metallic Platelets in a Brazilian Paraíba Tourmaline

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Editor’s NoteThis article details the gemological analysis of a rare 2.52 ct Paraíba tourmaline, confirming its Brazilian origin through advanced…

【Kobe, Japan】Pearl Prices Double in Three Years: Wave of Ethical Emphasis Spreads to Gemstones

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Editor’s NoteThis article examines the dramatic surge in pearl origin prices, which have more than doubled since 2019. The analysis explores the…

【Bangkok, Tha】Gemfields Emerald Auction Achieves Record Result

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Editor’s NoteThis report highlights the Gemfields Group’s record-breaking May auction in Bangkok, where both total revenue and average price per…

【New York, US】Record Auction for Giant Ruby Sold for USD 34.8 Million in New York

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Editor’s NoteA record-breaking 55.22-carat ruby, the largest ever to appear at auction, has sold for $34.8 million in New York. This article details…

【New York, US】Marlene Dietrich’s Bracelet Sells for Over 600 Million Yen at Auction

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Editor’s NoteA piece of Hollywood history has found a new home. Marlene Dietrich’s iconic ruby and diamond bracelet, worn to the Oscars and on…

【New York, US】55-Carat Ruby and 10-Carat Pink Diamond Each Set Record at $34.8 Million at Sotheby’s

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Editor’s NoteA new world record was set at Sotheby’s New York when the 55.22-carat “Estrela de Fura” ruby sold for $34.8 million, becoming the most…

【New York, US】Record Figure: The Millions Paid for the World’s Largest Ruby in the United States

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Editor’s NoteA record-breaking auction in New York saw two exceptional gemstones—a historic ruby and a rare pink diamond—each fetch nearly $35…