describes the appearance of the surface of a gemstone
. For example, a diamond
is said to have an adamantine lustre. The word lustre
traces its origins back to the Latin
, meaning "light", and generally implies radiance, gloss, or brilliance.
Other descriptive terms used for gems include metallic; for example pyrite has a metallic lustre. Vitreous, like glass; resinous, like amber; waxy, like jade; greasy, like soapstone; pearly; and silky.
The term is also used to describe other items with a particular sheen (for example, fabric), especially silk and satin.
See also hornblende for a description of lustrous ores.