Faceted Blue Spinel Gemstones, Soviet Gem expensive great brilliance and glow red

great brilliance and glow red under UV

throwing rainbows with the slightest provocation

As far as we know these are offcuts and failed rods that didn't quite make it into final production or usage

but the stones had too many rainbows and were obviously something different

Faceted Blue Spinel Gemstones, Soviet Gem expensive great brilliance and glow redThese are blue gems cut from old stock flame fusion spinel grown in the Soviet Union, sourced from an old collection The color intensity and darkness varies considerably from stone to stone, each is photographed individually. Blue Spinel is typically colored by cobalt, which gives it a red fluorescence with strengh varying based on cobalt concentration and codopant types. While this material is grown with the flame fusion method, in industry