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Rio Tinto Unveils Rare 158ct Yellow Diamond from Diavik Mine in Canada

One of the largest gem-quality yellow diamonds ever discovered in Canada, the 158.20-carat gem is a remarkable find as Diavik Mine nears closure.

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Rio Tinto has uncovered a rare and exceptional 158.20-carat yellow diamond at its Diavik Mine in Canada, marking one of the largest gem-quality yellow diamonds ever found in the country. This stunning discovery is also among only five yellow diamonds weighing over 100 carats to be unearthed by the company at Diavik throughout its 22-year history. Notably, Diavik is primarily known for producing white diamonds, with less than 1% of its output being yellow stones.

The Diavik Mine, which is set to close next year, is also responsible for several significant yellow diamond finds, including Canada’s largest yellow diamond, a 552.74-carat gem discovered in 2018, and the 187.7-carat Diavik Foxfire found in 2015.

With the closure of the Argyle mine in Australia in 2020, Diavik is now Rio Tinto’s sole diamond asset. Patrick Coppens, General Manager of Sales and Marketing for Rio Tinto’s diamond business, expressed excitement over the unique beauty and purity of the Diavik diamonds, eagerly anticipating the future of this extraordinary find.

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International News

Gemfields’ Higher-Quality Emerald Auction Fetches $26.8 Million

Strong Demand Continuing For Top-Tier Stones Despite Broader Market Caution Driven By Geopolitical Tensions and Macroeconomic Uncertainty.

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Gemfields reported revenues of $26.8 million from its latest higher-quality rough emerald auction, with strong demand continuing for top-tier stones despite broader market caution driven by geopolitical tensions and macroeconomic uncertainty.

The auction, held from 4 to 21 May 2026, saw 36 of 37 lots sold, representing a 97% sell-through rate. Of the 185,135 carats offered, 183,385 carats were sold, achieving an average realised price of $146.08 per carat.

The rough emeralds were mined by Kagem in Zambia. Buyers viewed the lots in Bangkok before bidding through Gemfields’ online sealed-bid auction platform.

Adrian Banks, Gemfields’ MD- Product & Sales, said:

“While demand for higher-quality emeralds remains stable, the market is presently exercising a degree of caution, influenced by ongoing geopolitical tensions and prevailing macroeconomic uncertainty…Competition and pricing for the top-tier emeralds remained particularly strong.”

Banks also pointed to the Indian rupee’s roughly 10% depreciation against the US dollar since Kagem’s previous higher-quality auction in September 2025 as an added challenge for many customers.

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