Sparkle and shine while wearing the Silver Mercury Dime Aurore Boreale Crystal Drop Double Strand Necklace. An Aurora Borealis Crystal hangs from a genuine Silver Mercury Dime set in a round silvertone bezel and together are the focus of this glamorous necklace. The Mercury Dime was minted from 1916 to 1945 and is composed of 90 percent silver. The double strand necklace is 18 inches long and has a lobster claw clasp for security. The necklace is composed of brass and pewter and is layered in rhodium. A Certificate of Authenticity is included.