Aquamarine: Aquamarine is a form Beryl that is similar in color to sea water. So it varies from green to blue just like the oceans. Most if not all Aquamarine has been heat treated to improve or lighten the color. Currently the most popular and therefore valuable colors of Aquamarine Beryl are the light "sky" blue versions. If Aquamarine receives large amounts of heat treatment it will bleach or be (read full)