Natural topaz very rarely occurs naturally in blue - this color is caused by treatment. Almost 100% of blue topaz in the market is colorless topaz that has been irradiated and heated to create its beautiful blue color. This treatment results in three commonly seen shades; light aquamarine "sky" blue, vivid "Swiss" blue and deep ocean "London" blue topaz. Blue topaz can look similar to blue zircon, but it is available in a much wider variety of shapes and sizes at affordable prices. This quality makes blue topaz extremely popular and the perfect choice as the alternative December birthstone!
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