Silver Mammoth HoopsOur classic hoop earrings are hand carved and set with rhodium plated sterling silver accents, post backs and clutches. 20mm Prehistoric woolly mammoth ivory is found by chance in the cold northern regions of Alaska, Canada, Russia, and Siberia. Fossil tusks may range in age from 10,000 to 200,00 years, an natural colors vary depending upon what minerals the tusk laid next to and for how many tens of thousands of years.