Faceted Blue Spinel Gemstones, Soviet Gem Stone:Marquise, 13.5x8mm, 4.95ct but we've been able to

but we've been able to buy a few old collections that contained some of this material

and which color predominates depends on the lighting (color and angle) as well as the background it is set against

also known as yttrium orthovanadate

I have also added two options for smaller 'starter' dice rough:

with a faceted LuAG Lumogarnet on the front

Faceted Blue Spinel Gemstones, Soviet Gem Stone:Marquise, 13.5x8mm, 4.95ct but we've been able toThese 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