Sparkle and shine while wearing the Silver Mercury Dime Crystal Drop Earrings. Aurora Borealis Crystals hang from genuine Silver Mercury Dimes set in round silvertone bezels and together are the focus of these glamorous earrings. The Mercury Dime was minted from 1916 to 1945 and is composed of 90 percent silver. The dangle style earrings have a fish hook closure and measure 2.5 inches in length. A Certificate of Authenticity is included.