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Hit it with a clean 785nm laser and the rovibrational modes of the crystal lattice downconvert (and upconvert aka anti-stokes but I digress...) about 1/10^6 photons to: http://www.bayspec.com/wp-content/uploads/2013/01/ramspec-78...

Unfortunatly, that's a bit tricky if it's underground. Fun to bring to a gem show though.

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