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These are faceted light blue ytterbium YAG
but cobalt spinel has a hardness of 8 and is ideal for use in all times of jewelry
Note that the smaller squares can sometimes be a bit more trapezoidal
This is a zincite crystal that I faceted
It weighs in at 11
Lithium Tantalate Faceted Stones, Sparkly Tantalia Loose Gems Gem:Round, 3mm, 0.25ct These are faceted light blueThese 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
