I found these wonderfully etched buttons in China and made them into earrings.  They are etched into mammoth ivory and surrounded with a border of teak to make them really stand out on your ears.

Mammoth Ivory comes from tusk of the extinct mammoth elephant that lived on the Earth  from about 4.8 million to 4,500 years ago (Pliocene era). Because they are extinct they are not endangered and therefore, are legal and save the African elephant.  The artisans that carved elephant ivory are now carving mammoth ivory that is recovered in Siberia.  Using mammoth ivory encourages the preservation of the African elephant.