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While the most famous type is the neon green cerium-doped LuAG
5) and durability
which when split will have mini 'geodes' filled with microcrystals
Golden laser garnet boule tips (Ce+Nd:YAG)
Bismuth Germanate BGO20 Faceted Stones, Rare Lab Sillenite yag While the most famous typeThese are faceted, lab grown BGO20 (Bismuth Germanate), a rare crystal grown for opto electrical purposes with incredible sparkle and fire. This is a real cool rarity in the gem world: bismuth germanate (in this case, specifically Bi12GeO20 aka sillenite). BGO20 has bizarre opto electrical properties which make it incredibly useful in niche applications, such as as an acousto optical modulator. It also has the highest density of any gem you can get,
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