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<p>[QUOTE=&quot;komokwa, post: 4589073, member: 301&quot;]&quot;); display: inline-block; height: 24px; width: 24px; margin-top: -1px; transform: rotateZ(-180deg);&quot;&gt;</p><p><br /></p><p><b>Untreated, natural turquoise of very high quality (sometimes called Precious Turquoise) resists color change</b>. But if turquoise is of moderate or lesser quality, it can be more likely to change color when it comes in contact with water and oils.</p><p><br /></p><p>&amp;</p><p><br /></p><p>Turquoise is a compound that includes metals such as aluminum, copper or iron. Water and oil can cause some of these metals to oxidize, or in other words rust. <b>As a result of oxidation, the stones can actually change color</b>. Blue turquoise that contains copper can change from a light blue to a dark green.[/QUOTE]</p><p><br /></p>

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