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 gem are treated to improve appearance. Treatment processes can consist of heat, irradiation, dyeing, oiling, or other processes. Detection of these treatments may be easy to nearly impossible. Treatments should always be disclosed to the consumer. The following is adapted from the American Gem Trade Association Treatment Disclosure Codes.Clarity enhancement/Fracture filling refers to the filling of surface breaking cavities or fissures with a colorless glass, plastic or similar substance. This process is done to improve durability, color and transparency and may add weight.Dyeing refers to one of the oldest treatments recorded. The treatment involves the introduction of a coloring agent into a gemstone to give it a new color, intensify an existing color or improve color uniformity.