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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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Hard Pure Gold to redefine China gold jewellery sector

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Record-high gold prices and continued geopolitical uncertainty have strengthened gold’s appeal as a safe-haven asset. However, these same factors also create challenges for the jewellery industry, as rising prices increase the cost of entry for consumers. In response, the industry is exploring product innovation to sustain demand. In Greater China, Hard Pure Gold is emerging as a strategic initiative designed to balance high purity, design flexibility, and affordability.

Promoted by the World Gold Council, Hard Pure Gold combines traditional purity levels—typically above 99%—with advanced manufacturing technologies such as electroforming and lost-wax casting. These processes increase the hardness of pure gold, allowing jewellers to create more intricate designs, improve durability, and support gemstone settings. At the same time, hollow-forming techniques enable lighter pieces that maintain visual impact while reducing overall weight and price.

The category also benefits from the introduction of an industry-wide standard in 2025, which clarified production guidelines and unified marketing terminology across manufacturers. Standardisation has helped build consumer trust and strengthened the positioning of Hard Pure Gold as a distinct product segment.

A key driver of its growth is changing consumer demographics. Traditionally, pure gold jewellery in China appealed primarily to middle-aged buyers who valued gold for wealth preservation. Hard Pure Gold, however, is attracting younger consumers aged 20–35 by offering contemporary designs, lighter weight, and lower entry prices without sacrificing purity. Surveys conducted by the World Gold Council indicate that it is currently the fastest-growing category within the gold jewellery segment in Greater China.

In a high-price environment, the ability to produce jewellery that looks substantial yet weighs as little as 1.5 grams helps make gold more accessible to new buyers. At the same time, increasing trade-in activity—where consumers exchange older jewellery for newer designs—encourages repeat purchases and keeps demand active.

From a strategic perspective, Hard Pure Gold demonstrates how technological innovation and coordinated industry standards can reshape consumer perception. By merging investment-grade purity with modern design and affordability, it offers a compelling pathway for sustaining gold jewellery demand in Greater China

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