|Metallic luster is the highest luster. Found on gems with a refractive index of 2.5 or higher. Equivalent to the polish on a metal object. Example: Hematite.
|Submetallic luster is slightly less lustrous than metallic.
|Adamantine luster is the luster exhibited by Diamonds and gems with a Refractive Index of 1.9 – 2.5.
|Subadamantine luster is slightly less than that of a diamond. Example: Zircon.
|Vitreous is defined as a glass-like luster. Gems with a R.I from 1.3 – 1.8. Example: Moonstone can exhibit a Vitreous luster.
|Subvitrious luster is somewhat less glass-like.
|Resinous luster is that of a substance formed from resin. Example: Amber.
|Greasy luster is seen on Serpentine.
|Waxy luster describes the luster observed on Jadeite and Nephrite.
|Dull luster describes the luster of Ivory.