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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