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“Clematis” BroochHemmerle (2016)Hemmerle’s innovative, and rather unorthodox, desire to pair top-notch gems with often-overlooked materials such as iron, coral and wood has become its calling card. At Tefaf, this fourth-generation designer of haute joaillerie will preview its latest collection, crafted from aluminium—a metal now associated with everything from drinks cans to fences, but prized for its rarity in the mid-19th century (guests at Napoleon’s table dined