You can give the range of weights for each fraction or the tolerances used on a separate page of the catalog or materials, as long as you state, on every page that includes a fractional representation, where the consumer can find the information. See the chart on page x for weight ranges. Because this laboratory-created stone may falsely register as a diamond on your thermal detector, you should ensure that you recognize moissanite for what it is. For example, newer testers can do this or you may need to learn other ways of distinguishing moissanite from diamonds. Gemstone Treatments Gemstone treatments or enhancements refer to the way some gems are altered or treated to improve their appearance or durability.
Irradiation can add more color to colored diamonds, certain other gemstones and pearls.
Impregnating some gems with colorless oils, wax or resins makes a variety of imperfections less visible and can improve the gemstones' clarity and appearance. Fracture filling hides cracks or fractures in gems by injecting colorless plastic or glass into the cracks and improves the gemstones' appearance and durability. Dyeing adds color and improves color uniformity in some gemstones and pearls. Bleaching lightens and whitens some gems, including jade and pearls. The Jewelry Guides advise that when a gemstone has been treated and the treatment is not permanent, you tell consumers this information.