Asterism, a six-rayed star, happens to a sapphire when there are tiny needle-like rutile inclusions growing in three orderly directions intersecting each other, and yet it is more tricky to a gem-quality star sapphire when it requires just enough quantity of rutile needles to produce the star effect but not blocking the visual transparency. The present colour-changing star sapphire is even rarer that it displays two amazing optical phenomena simultaneously, showing a complete change of body colour from intense blue to purple under different light sources, while displaying a distinct asterism atop its nicely domed surface.