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The appearance of the smooth surface of a mineral or some other substances due to the reflection that results from light striking the surface. It is a quality of opaque or translucent stones.
There are several kinds of lustre:
Lustre is seen on a smooth surface where ridges are present to reflect the light in many directions. The degrees of lustre, indicating intensity, are 'splendent' (mirror-like), 'shining' (indistinct), 'glistening' (feeble), and 'dull' (almost none).
Lustre should not be confused with sheen.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson