Very hard metamorphic cousin to nephrite black jade. Same composition, refractive index and polishing requirements but blacker and more opaque than the slightly more crystalline igneous nephrite. In my opinion this top quality material is blacker than the other new jades on the market including Absolute Black from Arizona and the black jade from Australia. May contain tiny gold specks of pyrite which look like stars in a midnight sky. Back of this stone is polished.
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