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blue laser Yb:YAG
Like normal Cr YAG (aka Christmas Garnet) it has a super rich green base color
Its only real downside is its hardness of 5 and brittleness
this is common for hydrothermal growth
or when illuminated by computer monitors or phone screens
Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round, 10mm, avg. 5ct blue laser Yb:YAGThese 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
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