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These are lab created laser rubies grown for use in the Strategic Defense Initiative
They are tan out of the ground and have to be treated to get a darker background
and on a black background it sometimes takes on a green cast
This means that it shows a mixture of red and green flashes
but these glass laser rods are an exception
BGO12 Bismuth Germanate Facet Rough Marked Letter:1pc 6-7g These are lab created laserThese are BGO 12 aka Bismuth Germanate facet rough. This is a real cool rarity in the gem world. Bismuth Germanate (in this case, specifically Bi3Ge4O12 aka evlitine) is valued as an optical substrate because of its highly unusual electrooptical properties. It has exceptionally good optical properties too, with (as far as we can tell the literature is weak) an RI of 2. 15 and dispersion of 0. 1. Cut stones are incredibly beautiful with high brilliance
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