Bill Diment & Associates: Handcrafted Prehistoric Ivory and Gold Nugget Jewelry The ivory in this product is guaranteed to be prehistoric. Tusks are found in the permaforst of Canada's Yukon, near historic Dawson city, where they are unearthed by placer gold mining operations. They come from the extinct wooly mammoth and/or mastadon known to have lived in this area ten thousand years ago.