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This is a rare natural gem known as Axinite--I don't cut a lot of natural stones but axinite is one of my favorites
It can be used to make lasers with tunable output wavelengths and especially powerful
where the more advanced and expensive Czochralski pulling method has to be used
more brilliance and fire and a cooler range of colors than diamonds do and I just find it more appealing visually
but this one went wrong in the process
Weird Yb:YAG Garnet Facet Rough, Experiment Gone Wrong crystal This is a rare naturalThis is facet rough of weird mutated Yb: YAG. We tried to have it grown, it usually comes out a vivid blue green, but this one went wrong in the process. It has a combination of browns, yellows, greens, and occasional blue, giving more of a pondwater set of colors instead of the typical deep aqua blue you get from Yb: YAG. Since this was done by accident we don't know if we'll have more, but the colors are neat!