Gemstone value of the stone. Some treatments are used widely because the resulting gem is stable, while others are not accepted most commonly because the gem color is unstable and may revert to the original tone. Heat can improve gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst, and partial heating with a strong gradient results in “ametrine” – a stone partly amethyst and partly citrine. Aquamarine is often heated to remove yellow tones, or
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