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Peridot
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==Appearance== Peridot is one of the few gemstones that occur in only one color: an [[olive-green]]. The intensity and tint of the green, however, depends on the percentage of [[iron]] in the crystal structure, so the color of individual peridot gems can vary from yellow, to olive, to brownish-green. In rare cases, peridot may have a medium-dark toned, pure green with no secondary yellow hue or brown mask. Lighter-colored gems are due to lower [[iron]] concentrations.<ref>{{cite book |last=Wise |first=Richard W. |year=2016 |title=Secrets of the Gem Trade: The connoisseur's guide to precious gemstones |edition=2nd |publisher=Brunswick House Press |location=Lenox, MA |isbn=9780972822329 |page=220 }}</ref>
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