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When I cut this moderately heavily included round I had no idea that it contained copper as a chromophore. I learned that later when I tested it with my spectrometer. It is a mildly attractive rather grayed green/blue under mixed light. Its crystal is not good and there are a wide variety of inclusion, none of them are a major distraction. It doesn’t have the “neon” look that is associated with cuprian bearing tourmaline. But I like it because it is different. It weighs 4.95 carats.