When it comes to December's birthstone, many people think of zirconia or turquoise. While they're both gorgeous in their own rights, we've decided to focus on another lovely gem: blue topaz. While it doesn't have the same fame as a diamond or elegance as a pearl, this gem is one that shouldn't be underestimated. Courtesy of: Michelle Jo via Wikimedia Commons 1. A Rainbow Stone Topaz is available in just about every colour of the rainbow. However, because the blue tone is so rare, sometimes blue topaz is actually a result of heating faint or colourless topaz. This might be something to...