The underside of the cabochon is rough and uneven to keep the rutile inclusions needed for a lovely, strongly visible star. Snug in a platinum, diamond accented mounting, our Art Deco star sapphire ring was most likely designed for the stone set into it. Star Sapphire command a higher price than regularly Sapphires and so miners link them with good luck and financial abundance. The higher the dome of the cabochon, the less the star will ‘move’ under a light source or when rotating the gemstone at different angles. High quality star sapphires are cut to center the stone’s asterism as perfectly as possible in the middle of the cabochon, and keep the points of the star of similar length. After determining that a star is even possible, due to a sheen on the rough gemstone, a lapidary must find the gemstone’s optic axis, and then begin to fashion the stone into a rounded cabochon shape. ![]() For a star sapphire to appear, the stone must have spindly, needle-like inclusions of a mineral called rutile that grow and intersect each other within corundum, the mineral we know as sapphire and ruby (yes, star rubies are also possible!) Ever wondered how star sapphires get their stars? It's created by an optic feat called asterism, from the Latin astrum meaning star.
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