The name "aquamarine" derives from the Latin “aqua” meaning water and “mare” meaning sea, because it looked like sea water. Aquamarines were said to have washed ashore from the depths of the sea, where they decorated the jewel caskets of sirens. Aquamarines - also called the "poor mans' diamond" - vary in color from deep blue to blue-green of different intensities, caused by traces of iron. Blue stones look lovely against most skin tones.