We offer Natural, Synthetics & Simulated Stones. Synthetics will have near identical properties as natural counterparts, and difficult to tell apart and are a better choice for the environment. Simulated stones merely imitate the gemstone; many times, used as birthstones. The most prized Amethysts are called Siberian Amethyst; highly prized, rare, and very expensive. Contrary to the name they do not come from Siberia. The term is related to the color-tables, known as Siberian Purple though they will contain splotches of red. Many imitations for this type. Be careful what you buy! We will be posting an Article under our Gemstone Education, noting such matters.