Glassy may be one word you could use to describe a diamond gemstone.
a vitreous luster (eg. diamond [C] or rutile [TiO2])
a hardness test, because nothing can scratch a diamond.
It is glassy.
Carbon: diamond, graphite, glassy graphite, graphene, fullerene etc.
A rough diamond is typically identified by its shape, surface texture, and luster. It may appear as a rough, uncut stone with a glassy surface and a crystalline structure. Gemologists can also use specialized equipment like a loupe or magnifying glass to examine the diamond's characteristics further.
When it is polished. Gemstones are rarely glassy when they're rough.
Ruby (corundum) has a vitreous or glassy luster.
Classy rhymes with glassy! Really? that's your question? wow.
Glassy-winged sharpshooter was created in 1821.
Elongate glassy perchlet was created in 1822.
Indian glassy fish was created in 1822.
Obsidian is an extrusive rock that cooled very rapidly without forming crystals. As a result, obsidian has a smooth, shiny texture of a thick piece of glass.