Topaz, and especially blue topaz (the most common color in jewelry), has grown in popularity over the years. The "pure" topaz color is yellow, and was often confused with chrysolite, the yellow variety of peridot. However, the use of distinct colors has helped topaz come into its own. Blue topaz has a watery blue color similar to aquamarine, but often without the green overtones - and its hardness and good clarity make it an excellent gem for jewelry. The blue color is often enhanced through heat-treatment and irradiation. Topaz is found in jewelry in a range of colors, from pale blue to pink to yellow. It gets its color from a mix of silicon, aluminum, fluorine and hydroxyl.
Topaz was believed to have incredible medicinal powers in The Middle Ages, even against the plague. For a healthy individual, it brought about a pleasant disposition and patience, and was a symbol of fidelity and love.
Blue topaz is December's birthstone. It has a Mohs hardness rating of 8, making it ideal for all types of jewelry.