Starstone

Starstone is a name applied to several stones characterized by a star-like glow or luminescence. It is not a single mineral; rather, it appears in different traditions and contexts to describe stones with varying compositions, appearances, and mythic associations.

In real-world gemology, the term “starstone” is sometimes used informally for stones displaying asterism, notably star sapphires and star rubies, which show a four- or six-rayed star when cut en cabochon. The star effect arises from intersecting needle-like rutile inclusions. The label can also refer to meteorites or lithic materials that catch the light in a luminous way, though there is no standardized mineral species officially named “starstone” in major classifications.

In fiction and popular culture, starstone is a common motif for a magical or mystical material believed to contain starlight or cosmic energy. It often functions as a power source, a catalyst for enchantment, or a ceremonial gemstone. Authors, game designers, and artists use the concept to evoke wonder, danger, or ancient lore.

Because the term spans diverse contexts, the exact properties of starstone depend on the tradition in which it appears. In geology and gemology, any star-like effect may be described as asterism; in fantasy, starstone can be imagined with a wide range of magical attributes.