Name your Palette: Description: Here is untreated very light green Aquamarine cushion concave cut weighing 6.50 cts, from Madagascar. Aquamarine is a routinely heated gemstone, because most material out of the ground come with a greenish tint and heating aquamarine will remove its green tinting, leaving a pure blue color. But many people actually appreciate the slightly green gemstones, knowing that they haven't been heat treated. http://www.multicolour.com/gemstones/aquamarine.html