Gemstone few as one in a million atoms. These so-called impurities are sufficient to absorb certain colors and leave the other colors unaffected. For example, beryl, which is colorless in its pure mineral form, becomes emerald with chromium impurities. If manganese is added instead of chromium, beryl becomes pink morganite. With iron, it becomes aquamarine. Some gemstone treatments make use of the fact that these impurities can be "manipulated", thus changing the color of the gem. Gemstones are often treated to enhance the color or clarity of the stone. Depending on the type and extent of treatment, they can affect the
Aquamarine (novel) from her six sisters, and is suffering from the chlorine in the pool. Hailey and Claire advise Aquamarine to return to the ocean, however she refuses, because of her new attachment to Raymond. Claire and Hailey read books that contain information pertaining to marine life-forms, trying to find an answer to Aquamarine's troubling conditions. They learn that mermaids cannot survive on land for more than a week. The necessity of returning Aquamarine to the ocean is thus made more urgent. In order to persuade Aquamarine to return to her home, Hailey and Claire arrange that she will spend one evening