![]() ![]() ![]() Star sapphires – rare sapphires which reflect a star in certain light conditions – occur when fine needle-like inclusions of minerals such as rutile are aligned parallel to the six sides of the hexagonal crystal shape of a sapphire. ![]() Yellow sapphires are often caused by the presence of iron without the involvement of titanium. EPE/AAPĬorundum that is red is known as ruby – and results from the presence of chromium substituting for aluminium in the crystal structure. Now the Duchess of Cambridge, Catherine Middleton’s engagement ring – a sapphire surrounded by diamonds – once belonged to Diana, the late Princess of Wales. ![]()
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