![]() However, you should be wary of stars that are too perfect – many man-made star sapphires exist on the market, and this is a tell-tale sign that the star is painted on. ![]() They generally have uneven tops or bottoms, which is often necessary to allow the star to be properly orientated and to display the best asterism. This Art Deco star sapphire ring has a clear star in the bottom centre of the grey-blue stone.Ī star sapphire needs to have the right amount of rutile to allow it to be cut and polished, and they are often cut into cabochons with high domes to maximise the star effect. This causes the light to reflect in a rather unique way, causing a star to form on the stone. However, in black star sapphires, both their colour and stars are caused by the shiny mineral hematite. ![]() The optical phenomenon within a star sapphire is known as asterism.Īsterism – from the Latin ‘astrum’, meaning star – is caused by small needle-like inclusions of the mineral rutile. ![]() They have long been a highly coveted and prizes stone, used both for aesthetic purposes and as a talisman across centuries. A star sapphire is a variety of sapphire which exhibits a unique reflection, giving the impression of a star trapped within the stone. ![]()
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