Well. That is a good question. Rainbow Calsilica is it real or not? It is most definitely real as in a real material fashioned into slabs and cabochons.
But the source of this material is man-made without any doubts nor questions!
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A relatively new, but not brand new, fake on the market now is quartz that is cut in typical tourmaline designs and is then coated to look just like watermelon tourmaline. It is the typical CVD method used in the well known Mystic Topaz line of products. The treatment is not the problem, but that many unscrupulous vendors and dealers are selling these pieces as real watermelon tourmaline!
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