Diamond

Diamond is the only gemstone composed of a single element: pure carbon. Crystallised under extreme pressure and temperature deep within the Earth’s mantle, it has a Mohs hardness of 10, which makes it the hardest known natural material. In a coloured-gemstone context, high-quality colourless diamonds are principally used as brilliant accent stones — in halos or as side stones — to contrast with and support a central coloured gem. Naturally coloured “fancy” diamonds (canary yellows, pinks, blacks) form their own tier of the market.

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