London Blue Topaz vs. Swiss Blue Topaz: What’s the Difference? Swiss Blue Topaz is a gemstone that is, however, staggering as it could be intriguing. It is an individual from the Topaz family, a mineral made of aluminum and fluorine. This alluring gemstone is named after the amazing blue waters of Switzerland's lakes and waterways, which look in variety and power. Swiss Blue Topaz is a gemstone exceptionally valued for its energetic blue tone, from a distinctive sky blue to a rich, dark blue. Its brilliant and striking variety makes it the most sought-after gemstone on the planet, and it is a famous choice for both formal & informal jewelry.