Mammoth Ivory HoopsPrehistoric woolly mammoth ivory hoop earrings are marked with rhodium plated sterling silver accents and posts. The perfect classic hoops. Prehistoric woolly mammoth ivory is found in the cold northern regions of Alaska, Canada, Russia, and Siberia, and may range in age from 10,000 to 200,000 years. Natural colors of this style may include cream or light tan depending upon where the fossil material was buried, and for how many tens of thousands of