Jihiwa's ruby under green laser light
(Color-corrected image)
#geology #gemology #science #lasers #ruby

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Exposing a ruby to a green laser beam causes it to glow red; the chromium that colors the stone absorbs the energy, and re-emits it as red light.

Lasers tend to wreck havoc with digital cameras -- so in this image, I color-corrected the stone to be much closer to what the human eye sees.