Faceted Blue Spinel Gemstones, Soviet Gem expensive These labgrown sapphires have bubbles

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

5ct and the light golden samarium YAG weighs in at 34

It weighs 74g and measures about 38x30x28mm

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

Its high hardness (8

Faceted Blue Spinel Gemstones, Soviet Gem expensive These labgrown sapphires have bubblesThese 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