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 simply renaming ICE names, such as changing the world name from Kulthea to Elanthia, and renaming the deities while keeping their previous characteristics. Game mechanics were greatly changed with the de-ICEing (as the period is colloquially named), which required every game character to undergo significant changes. Character racial and class choices were also changed, making any direct translation between the two systems difficult. The end result was that every character was required to "re-roll" their character with the option to change race and skills, but maintaining their old experience level, class, and equipment. "GemStone" became available on AOL in September,