Blue topaz has become one of the most popular gemstones on the market today, due to its clarity, durability, availability and affordable cost. Yet it is a shade of topaz rarely found in nature. The stone's watery blue color is most often created through a combination of heat treatment and irradiation.
Topaz is one of the well-known pegmatite minerals that also includes beryl and tourmaline. Blue topaz is the birthstone for December - and is also the recommended gemstone for couples celebrating their fourth wedding anniversary.
Blue topaz has a definite, uniform color ranging from sky blue to Swiss blue. It is sometimes confused with the more costly aquamarine - yet whereas aquamarine sometimes has a great.