Faceted Blue Spinel Gemstones, Soviet Gem Stone:Marquise, 13.5x8mm, 4.95ct and which color predominates depends

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

triboelectric and photoelastic among other properties that make it indispensible for all kinds of scientific and industrial applications

These are Christmas garnet earrings and pendants set in solid sterling silver

The camera overstates the red vs the eye and struggles to capture the green

Faceted Blue Spinel Gemstones, Soviet Gem Stone:Marquise, 13.5x8mm, 4.95ct and which color predominates dependsThese 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