Aquamarine is a pale-blue to light-green variety of beryl. The color of aquamarine can be changed by heat. The aquamarine has a chemical composition of Be3Al2Si6O18, also containing Fe2+. It has a hardness of 7.5 to 8. Aquamarine contains no or few noticeable inclusions. But it can have inclusions like mica, hematite, or salt-water.