Emerald Emerald Emerald is a gemstone and a variety of the mineral beryl (BeAl(SiO)) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate. The word "emerald" is derived (via and ), from Vulgar Latin: "esmaralda"/"esmaraldus", a variant of Latin "smaragdus", which originated in (smaragdos; "green gem"). Emeralds, like all colored gemstones, are graded using four basic parameters–the four "C"s of connoisseurship: "color", "clarity," "cut" and "carat weight". Normally, in 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