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
GemStone IV named "Avalon" is available for Mac OS X. No official Linux client exists. "GemStone" was first demonstrated to GEnie in 1987 before Simutronics was officially incorporated. It was only used as a demonstration model and was never available to the general subscribers. "GemStone ][" was released in April 1988 to GEnie customers. However, "GemStone ][" was very short-lived, and "GemStone III" went into open beta testing in December 1989, officially launching on February 1, 1990. The transition from "][" to "III" maintained significant portions of the environment, but not all, and character records were not maintained over the transition, requiring