Gemstone irradiation produce mixtures of blue and yellow-to-brown colors, so heating is required as an additional procedure to remove the yellowish color. In some cases, the new colors induced by artificial irradiation may fade rapidly when exposed to light or gentle heat, so some laboratories submit them to a "fade test" to determine color stability. Sometimes colorless or pink beryls become deep blue upon irradiation, which are called Maxixe-type beryl. However, the color easily fades when exposed to heat or light, so it has no practical jewelry application. Gemstone irradiation The gemstone irradiation is a process in which a gemstone is artificially
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