13.78ct Unheated Raw Tanzanite CrystalThis natural unheated tanzanite crystal is almost a bicolor, as towards the termination there is much richer violet blue color than the base of the crystal. You can see the zoning clearly and it has a very neat look! This crystal weighs 13. 78 carats and measures 18. 9mm x 10. 8mm x 7. 7mm. This crystal is unheated and shows the trichroic colors in the dichroscope.
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