Radiomir Panerai Tourbillon: 1. Tourbillon Gravity can throw a watch out of synch. The tourbillon, an 18th century invention, spins and rotates to counteract gravity’s pull. 2. Ceramic Not only is a ceramic watchcase lighter, harder and more scratch resistant than a steel case, it also looks tough. 3. Jewels Sapphires and rubies are placed at key points to reduce friction. The standard for fine watches is 17 gems; this watch has 31.