gemstone
Swiss Blue Topaz
Al2SiO4(F,OH)2
Hardness of 8 on the Mohs scale, bright vivid blue color, vitreous luster, orthorhombic crystal system, perfect basal cleavage, specific gravity of 3.49 to 3.57
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Physical properties
Hardness of 8 on the Mohs scale, bright vivid blue color, vitreous luster, orthorhombic crystal system, perfect basal cleavage, specific gravity of 3.49 to 3.57
Formation & geological history
Formed in pegmatites, high-temperature quartz veins, and cavities in granitic and rhyolitic rocks. Most vibrant blues on the market, such as Swiss blue, are produced by irradiating and then heat-treating colorless natural topaz.
Uses & applications
Widely used in fine jewelry such as rings, necklaces, and earrings
Geological facts
Topaz is the birthstone for November and the state gemstone of Utah. Natural vibrant blue topaz is extremely rare, so almost all Swiss blue and London blue stones are treated.
Field identification & locations
Easily identified in jewelry by its brilliant vitreous luster, high hardness, and distinct bright blue saturation. Commonly sourced from Brazil, Sri Lanka, Nigeria, and Russia.
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