Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round (Crackled), 6mm, avg. 0.9ct Like all rubies they have

Like all rubies they have a high hardness of 9

and like Ce:YAG and LuAG it is used as a scintillator to help detect invisible radiation

pure emerald green color with no fluorescence

The Big One is a segment of a 1m long laser rod with one polished

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

Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round (Crackled), 6mm, avg. 0.9ct Like all rubies they haveThese 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