Aqua is the Latin word for water. Aqua is a greenish-blueish color, similar to the color cyan. Aqua is identical to cyan, also sometimes called electric cyan, one of the three secondary colors of the RGB color model used in computer and television displays. In the HSV wheel, aqua is halfway between green and blue. Aqua is also a popular color, even to kids. You can see some stones, like aquamarine, topaz and even zircon that has aqua in them. The colour Aquamarine is extremely similar to aqua, but can be a bit brighter.