A treated jar and a sun colored jar are different and seem to have different values. Sun colored jars are more natural. the amethyst color is caused by exposure to the sun's UV rays, is more suttle . A treated jar is one that is exposed to high intensity UV, usually in a hospital in machines that blast instriments to disinfect them, or long period under a UV light. IT's easy to tell because of the intensity of the color. many in this hobby look down on treated glass because it is not natural hence lower value. Personally, I really like the treated ones,.... but don't tell anyone.