Blue Sapphire and Diamond Cluster Ring in Platinum

Sapphire belongs to the corundum mineral family, composed of aluminium oxide (Al₂O₃). In its purest form, corundum is colourless, but trace elements such as iron and titanium create the captivating blue hues for which sapphire is celebrated. The interaction between these elements can produce an extraordinary spectrum of blues, from delicate cornflower shades to deep, velvety tones.

This sapphire originates from Kanchanaburi in western Thailand, a region with a fascinating history of gemstone mining. Thai sapphires have long played an important role in the international coloured gemstone trade, with the country becoming one of the world’s leading centres for sapphire cutting and trading.

The emerald cut, with its distinctive stepped facets and geometric outline, offers a different character from the sparkle of a brilliant cut. Rather than emphasising scintillation alone, its broad facets draw attention to the gemstone’s colour and internal character.

With a hardness of 9 on the Mohs scale, sapphire is surpassed in hardness by only a small number of natural minerals, including diamond. Its combination of durability, beauty and remarkable colour has made it one of the most treasured gemstones throughout jewellery history.

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