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5 and no durability issues
BGO-20 Shards: Used as an acousto-optical modulator
Like Ce:YAG and LuAG it is used as a scintillator to help detect invisible radiation
but in the mean time these crystals broke during growth so we got them to repurpose as gems
I think the incredible blue glow makes it all worthwhile
Pure Er:YAG Rough, Erbium Color-Change Garnet chain 5 and no durability issuesThese 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.