Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round (Crackled), 6mm, avg. 0.9ct pure emerald green color with

pure emerald green color with no fluorescence

Though the gem world sometimes thinks of it only as a diamond stand-in I prefer to think of it as a gem all its own

Like all rubies they have a high hardness of 9

it usually comes out a vivid blue/green

Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round (Crackled), 6mm, avg. 0.9ct pure emerald green color withThese are faceted labmade Zinc Sphalerite (ZnS). While facet grade sphalerite is only rarely found in nature (and usually has a dark red or orange color), and is very difficult to cut, if you're brave enough to cut it, the resulting stones have incredible fire and dispersion. Colorless ZnS is grown for use for optics, and various doped versions are used as phosphors if you have an old oscilloscope, the iconic blue or green display panel likely used