Carl K. Gumpert, Inc. and its divisions Pacific Gem Cutters and Dynasty Diamonds supply colored gemstones which are of natural origin, unless otherwise stated. These gemstones were subjected to one or more treatment processes consistent with common industry practice in order to improve, enhance, intensify or otherwise alter its color. These processes are believed to be permanent under normal conditions. Long term exposure to certain types of light or non-standard atmospheres can cause the color to fade over time. In some cases, use of an ultrasonic cleaner or solvents can cause irreparable harm to the stone or its treatment. A complete list of colored gemstones, their respective treatments and proper care can be supplied to you upon request. Center and color gemstones are provided based on size (millimeter dimensions); colored gemstone weights can vary ±15%. Costs are based on specific market conditions and are subject to change without notice. View gemstone treatment glossary View a table of known gemstone treatments