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As one of the properties in minerals, there are different types of luster as there are different mineral categories. Luster is divided into two categories namely nonmetallic and metallic. Metallic minerals tend to have a shiny and opaque appearance. There are various sub-categories of luster in nonmetallic minerals.
Black: Symbol of Dignity. Judging Pearl Quality Luster Luster is the quantity and quality of light reflected from the surface of a pearl. Luster does not simply mean a shiny surface: it implies the structural beauty of the nacre. High luster pearls also have a deep-seated glow. The luster of a good quality pearl should be bright and not dull. You should be able to see your own reflection clearly on the surface of a very high luster pearl.