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French Art Deco untreated sapphire and diamond ring

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French Art Deco untreated sapphire and diamond ring. Hand made in 18ct white gold in the 1920’s, this sapphire and diamond combines the elegance of the Art Deco era with the wonder of the untreated sapphire.

A brief history on heat treating sapphires and rubies:

Sapphires and rubies have been heat treated for centuries to improve their colour and clarity and this is a worldwide accepted practice, however it is estimated that only between 1% and 5% of sapphires are good enough to be set into jewellery without being treated. It should be clarified that a sapphire or ruby that has undergone some form of heat treatment is still a natural gemstone from the ground and is not a synthetic/man made stone and the treatment is completely stable. Lately on the market there is a technique of glass filling or lead filling stones which will improve the colour of a natural gemstone, however this treatment is very unstable and the stone may look worse in a few years.

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