Pure Er:YAG Rough, Erbium Color-Change Garnet Stone:Edge, 12.5×11.8×10.7mm, 5.02g It's the hardest gem that

It's the hardest gem that can feasibly be cut into a die and it is more brilliant than a diamond

This is a custom cut pink and yellow lab sapphire done in a pixel cut tablet heart

This is facet rough of weird mutated Yb:YAG

You might be wondering "why is fluorite jewelry is so rare when it's so cool

and they would also be good for cutting exceptionally large round cuts

Pure Er:YAG Rough, Erbium Color-Change Garnet Stone:Edge, 12.5×11.8×10.7mm, 5.02g It's the hardest gem thatThese are facet rough of erbium doped YAG, a lab grown garnet used in lasers for both medicine and industry. Erbium YAG has a very obvious color change between different light sources. Under sunlight and cool LEDs it's a nice orange, but it shifts easily, changing color between Cool LEDs (orange), Warm LEDs (yellow), CFL (strawberry pink), and OLED (magenta) as well as under fluorescent lighting and OLED illumination. Sunlight shows an orangeish pink.