It is time to talk about Aquamarine Crystal, Meaning, Properties and Power of Aqua Blue Gemstone. Starry Moon Necklace with AAA Grade Aquamarine Aquamarine is a semi-precious gemstone. It has a greenish-blue to pale blue colour, similar to the deep blue sea. The stone gets its name from two words: 'Aqua' and 'Marine'. Together it means 'sea water' or 'color of the sea. It has a serene and soothing effect, as implied by the name. The effect is the same as sitting by the ocean