Samuel B. Sterling Silver Turquoise Comet Ring, Size 7. Our Sterling Silver round turquoise stack ring, handcrafted in Bali by our skilled artisans. From our signature collection, Royal Bali™ featuring designs handcrafted using sterling silver, and genuine gemstones. Turquoise, is regarded as a love charm. It is also a symbol of good fortune and success, and it is believed to relax the mind and to protect its wearer from harm. Turquoise rings, in particular, are thought to keep away evil spirits.