Although many believe wearing mammoth ivory is a more ethical choice than elephant ivory, wearing mammoth ivory jewlery may actually lead to the increase of endangered elephant poaching for their tusks.
Since mammoth ivory is more valuable than elephant ivory, poachers are likely to disguise elephant tusks as mammoth tusks to meet the demand for ivory.
Once a tusk is processed into jewelry or a carving, even top experts and advanced wildlife forensics labs have a hard time telling where it came from.
Because of this, India has banned mammoth ivory.
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Read More: http://www.luxist.com/2010/08/19/the-fashion-statement-woolly-mammoth-ivory-is-huge/