Star sapphires are renowned for their striking asterism, where a symmetrical star pattern appears on the dome of the cabochon-cut gemstone. This optical wonder is due to the precise orientation of silky needle-like inclusions, often rutile, within the crystal structure. The light reflecting off these inclusions creates a six-rayed star that seems to glide smoothly across the stone as it catches the light from different angles. The phenomenon is most pronounced under direct light sources, such as sunlight or focused artificial light. The allure of star sapphires is not only in their rarity and beauty but also in their historical association with luck and protection.
