BGO12 Bismuth Germanate Facet Rough Marked Letter:1pc 6-7g In sunlight it has a

In sunlight it has a strong golden hue while some indoor lights will make it more pure yellow or more orangeish

no durability issues and good optical properties which make it sparkle brilliantly

Laser Alexandrite: An amazing material grown mostly for medical lasers

They are tan out of the ground and have to be treated to get a darker background

It likely didn't quite make it through QC before final shaping

BGO12 Bismuth Germanate Facet Rough Marked Letter:1pc 6-7g In sunlight it has aThese 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