Gemstone Treatment Guide
Most items that you come in contact with every day have been treated in some way: Clothes have been dyed, houses have been painted, and most wood has been pressure treated. Gemstones are not any different. When a gemstone is forming deep within the earth, natural heating and pressure occur. In order to bring more gemstones to the public, many companies continue that process with additional heating, pressure, or other treatment techniques. It is estimated that up to 80 percent of all gemstones have been treated in some way. The following codes and definitions are adapted from the American Gem Trade Association's Gemstone Enhancement Manual, Edition 6.1 June, 1997, which is the industry standard for disclosure to consumers.