The word aqua-marine refers to a blue-green color that can be found in oceans and gemstones. The antonyms for aqua-marine would be colors that are on the opposite side of the color wheel. These colors would range from red to orange and yellow, which are known as warm colors. In contrast, aqua-marine is a cool color, and its antonyms would be warm colors that are associated with heat and passion. Some examples of the antonyms for aqua-marine include fire-engine red, blazing orange, and golden yellow. These colors can create a completely different mood and atmosphere from aqua-marine, which is soothing and calming.