Colored stone are usually treated to enhance their clarity and color. The treatments done to a gemstone can, and does affect, its value. But it all depends on the type and extent of treatment. Some treatments are used widely because the resulting gem is stable and make for great centerpieces in colored stone jewelry, while others are not accepted most commonly because the gem color is unstable and may revert to the original tone. One kind of treatment done to colored stones is through heating as heat can improve gemstone color or clarity. Another is through radiation, which has the effect of being able to "change" the color like the way most blue topazes are irradiated to change its color from white to blue. Waxing and oiling procedures are another treatment that guises natural fissures in some colored stone and as well as to make them appear to have a better color and clearer.