LIST: Ultimate transparency — Hublot’s sapphire evolution, in 14 watches

Time and Tide

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robert august.

First things first, what is sapphire crystal? Essentially, it’s the same stuff used to make a watch ‘glass’ and display casebacks, formed by crystallising aluminium oxide at very high temperatures to create an extremely hard material. Roughly speaking, it mimics what Earth has taken 400 million or so years to do, to form natural sapphire gemstones. For sapphire-cased watches, the middle, bezel and back are milled from solid blocks of the material. Because it’s almost as hard and scratch-resistant as diamond (9 on the Mohs scale, as opposed to 10 for diamond), the task of milling it into the complex shapes required is much more easily said than done. Indeed, sapphire crystal can be cut only by diamond.



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