The Truth About Swiss Blue Topaz Durability: Is It as Strong as It Looks? Swiss Blue Topaz is a beautiful gemstone profoundly esteemed for its distinctive blue tone and outstanding clarity. However, many individuals wonder about the durability of Swiss Blue Topaz and whether it is a firm gemstone or if it is prone to chipping or damage. The truth is that Swiss Blue Topaz is a relatively strong gemstone, but it is still essential to take proper care of it to ensure its longevity. Swiss Blue Topaz is a variety of the Topaz mineral, which is a complex and tough mineral that ranks 8 on the Mohs scale of mineral hardness. This means that Swiss Blue Topaz is more durable than most gemstones, including quartz and amethyst.