What does asteriated mean?
Asteriated is an adjective used chiefly in gemmology to describe minerals—most famously sapphires and rubies—that exhibit asterism, a striking optical effect in which a star-shaped pattern of light appears on the surface of the stone. The effect arises from tiny, needle-like inclusions of rutile aligned along the crystal's axes; when such a stone is cut en cabochon, polished into a smooth dome rather than faceted, and viewed under a single light source, intersecting bands of reflected light form a moving, multi-rayed star. Stones described as asteriated are highly prized, and the phenomenon lends names such as "star sapphire" and "star ruby" to well-known gems. The word derives from the Greek astēr, meaning star, via the noun asterism, and remains a technical term largely confined to jewellery trade publications, auction catalogues, and mineralogical writing rather than general conversation.
adjectiveOf a mineral or gemstone: exhibiting asterism, that is, displaying a star-shaped figure of light when cut en cabochon and viewed under a single light source.
- (of a gemstone) exhibiting asterism; displaying a star-shaped reflection of light when cut en cabochon
"The jeweller prized the asteriated sapphire for the six-rayed star that glided across its dome in sunlight."
"Her engagement ring was set with an asteriated ruby whose star shimmered as she moved her hand."
"Gem cutters deliberately leave asteriated stones unfaceted, polishing them into smooth domes so the rays remain visible."
An asteriated sapphire holds a hidden star: tilt it toward the light and a six-rayed figure seems to float across the stone's surface.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of asteriated
Asteriated comes from the Greek word astēr, meaning "star," which passed into Latin as aster and gave English a whole family of star-related terms, including asteroid, asterisk, and astral. The adjective was formed on the noun asterism—the name for the star effect itself—and entered English through scientific and mineralogical use, becoming established among gem dealers and lapidaries for stones that display this optical phenomenon.
Related word forms
How asteriated is actually used
"Asteriated" belongs to the specialised vocabulary of gemmology and jewellery and is rarely encountered in everyday speech. It is used almost exclusively attributively or predicatively of stones such as sapphires and rubies, and carries no figurative sense in standard usage.
Easily confused with asteriated
"Astricted" is a Scots legal term meaning bound by an agreement or contract, whereas "asteriated" describes a gemstone showing a star-like effect of light.