Herkimer Earrings. These earrings are sterling silver and feature Herkimer diamond crystals. They are accented with 14 kt gold filled rings. Herkimer diamonds are actually double terminated crystals that are mined in New York. These stones are said to transmit energy, and can receive spiritual energy, as well as amplify and focus that energy. Herkimers are also said to be harder, stronger and able to handle difficult situations beyond the limit of other quartz crystals.