Swiss Blue Topaz vs Moonstone: The Ultimate Comparison Swiss Blue Topaz is a variation of the topaz mineral and is one of the most prominent blue gemstone in the world. It is famous for its deep, vibrant blue color, which is generated by treating a natural topaz stone. The stone is then heated to maintain the color and make it permanent. Swiss Blue Topaz is a durable gemstone, and it has a hardness of 8 on the Mohs scale, which makes it suitable for everyday wear. It is found in various parts of the world which includes Brazil, Nigeria and Sri Lanka. However, the most popular Swiss Blue Topaz Gemstones are procured from Switzerland, where the gemstone gets its name. One of the most important benefits of Swiss Blue Topaz is its affordability. It is comparatively a inexpensive gemstone, which makes it a perfect option for those who want a beautiful and durable gemstone without investing much.