Gemstone few as one in a million atoms. These so-called impurities are sufficient to absorb certain colors and leave the other colors unaffected. For example, beryl, which is colorless in its pure mineral form, becomes emerald with chromium impurities. If manganese is added instead of chromium, beryl becomes pink morganite. With iron, it becomes aquamarine. Some gemstone treatments make use of the fact that these impurities can be "manipulated", thus changing the color of the gem. Gemstones are often treated to enhance the color or clarity of the stone. Depending on the type and extent of treatment, they can affect the
Shades of cyan one of the Sharpie (marker) permanent markers but not as bright on the marker. However, there is no mechanism for showing fluorescence on a computer screen. Aquamarine is a shade of cyan toned towards green. It is named after the mineral aquamarine, a gemstone mainly found in granite rocks. The first recorded use of "aquamarine" as a color name in English was in 1598. AuroMetalSaurus is dark grayish shade of cyan. Blue-green has been a Crayola color since 1930. Displayed at right is the color Caribbean Current. At right is displayed the color celeste. Bleu celeste ("sky blue") is a