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When it's grown with industrial purity
Natural Andamooka Matrix Opal: Big chunks of natural opal in matrix from Andamooka
but cobalt spinel has a hardness of 8 and is ideal for use in all times of jewelry
It weighs in at 11
This material cuts bright
Lithium Tantalate Faceted Stones, Sparkly Tantalia Loose Gems Gem:Round, 3mm, 0.25ct When it's grown with industrialThese are lab created white lithium tantalate gems. Lithium tantalate (LiTaO3) is an old rarity of the gem world and rarely seen today outside of industry. It was briefly used as a diamond simulant and marketed as 'tantalia', but was never very successful tantalate is much brighter and more dispersive than a diamond,so there was an obvious difference when cut. Faceted lithium tantalate gems give off brilliant rainbows of color, so it's an amazing gem
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