Pink to Red tourmaline is known as rubellite, and the color is probably from manganese. It is one of the most valuable of the tourmalines when the colors are dark and rich. Large flawless stones are rare, as the pink variety tends to have more flaws.
Greens - there are two distinct families of green tourmaline, one contains trace amounts of chromium (and coincidentally is called Chrome Tourmaline). It has a high value. Other shades of green may run from light green, to dark olive green and they tend to have less value than the chrome, blue or pink
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