Faceted Blue Spinel Gemstones, Soviet Gem expensive Lumenite™ is a monocrystal of

Lumenite™ is a monocrystal of strontium aluminate

These labgrown sapphires have bubbles in them from the growth process -- we call this variety 'strawberry sapphires' since they have seeds

throwing rainbows with the slightest provocation

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

Faceted Blue Spinel Gemstones, Soviet Gem expensive Lumenite™ is a monocrystal ofThese 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