Star ruby is a rare variety of ruby that exhibits asterism; a six-rayed star that shimmers over the surface of the stone when it is moved. The star effect is owed to aligned needle-like rutile inclusions. It is the rutile which is responsible for its silky shine.

Star ruby is a rare and natural variety of ruby gemstone that exhibits a star-like visual effect (called Asterism) when seen under single light source. It is regarded as a strong healing gemstone and worn to reduce stress, gain inner peace and maintain physical health.