Aquamarine Victorian Style 925 Sterling Silver Plated Ring Size 6.5 Aquamarine's color range is very narrow: It can be blue, very slightly greenish blue, greenish blue, very strongly greenish blue, or green-blue. The gem's most valuable color is a dark blue to slightly greenish blue with moderately strong intensity. The Ancient Romans and other civilizations believed the stone had healing properties and used it to treat various disorders. Some civilizations believed Aquamarine could increase youth, intelligence, foresight, courage, and happiness. Wearing this gemstone is thought to bring the wearer many good things.