My other birthstone is Topaz. Naturally occurring in yellows, orangy (rare), blues, reds, pinks and even colourless. The colourless variety are often coated with treatment to create Mystic Topaz.
My favourite colour is the blue. It ranges from a light sky blue (almost white) to a deep dark London Blue, covering just about every shade in between.
In mysticism, the topaz is attributed with a cooling, styptic and appetising effect. (Source: http://www.gemstone.org/gem-by-gem/english/topaz.html)