When the stone is formed it includes uniform impurities of titanium dioxide contained within the mineral rutile. ![]() Star stones develop their impressive pattern due to a phenomenon called asterism, a word derived from the ancient Greek word for star. ![]() It is no surprise that they command the highest prices and are set into the most exquisite of jewellery, but what causes a stone to develop a “star” within it? Asterism The shifting star pattern which shines within them has an otherworldly quality – perfectly symmetrical and shifting in the light. Star sapphires and star rubies are the rarest and most valuable stones of their type.
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