Start your review of gemstone enhancement heat irradiation impregnation dyeing and other treatments which alter the appearance of gemstones and the detection of such treatments write a review nicolas francfort rated it it was amazing. Gemstone treatments treatment refers to any process other than cutting and polishing that improves the appearance of the color or clarity or that are used to alter the appearance color clarity or phenomena durability value or supply of a gemstone today most gems are treated to improve appearance. For gemstones not covered by the n and e symbols a code covering the specific gemstone enhancement will be listed symbols for specific forms of enhancement b bleaching the use of heat light and or chemicals or other agents to lighten or remove a gemstones color this is often accompanied by subsequent dying and or impregnation. The term treatment is an indicator of whether a gemstone has been treated or not enhancements are the specific changes that have been applied to treated gemstones both gemstone treatments and gemstone enhancements have codes that indicate what has been done to the gemstones appearance
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