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Because of its pleochroism, cutting direction determines tanzanite's overall face-up color. When you...

Because of its pleochroism, cutting direction determines tanzanite's overall face-up color. When you...

GIA
Because of its pleochroism, cutting direction determines tanzanite's overall face-up color. When you look at it from one angle it appears blue, but from a different angle it appears purple. Learn more about one of the December birthstones. http://bit.ly/2QIF5Vw Photo: Robert Weldon/GIA. Courtesy: Meg Berry

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