Luster
光沢／コウタク
光泽
Luster
Éclat
Glossary
Thematic
Jewellery, Technic
The effect produced by the reflection of light on the surface of a stone. Its intensity depends on the refractive index of the stone and the quality of its polish. Lustre can be vitreous, resinous, waxy, pearly or silky.