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Turquoise is often treated with wax to give it a nice, even shine. You can see little areas of wax that melted when a hot tool was held near the gem. - Photo by Shane F. McClure/GIA
This turquoise contains grains of other crystals such as pyrite and quartz. - Photo © John I. Koivula
Turquoise that was treated to improve its color might show a deeper, more concentrated color in its cracks. - Photo by Shane F. McClure/GIA

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