If translated into numbers, platinum for all its known deposits is considerably rarer than gold and is the rarest metal of all. And it is, in truth, a gift from heaven. Platinum is much rarer than gold and silver, so rare that, in fact, all the platinum mined could fit in your living room. Given the supply and demand factors for platinum and palladium right now, it's worth considering both metals to include them in your portfolio.
For those looking for the best self directed IRA for gold, it's worth considering platinum and palladium as well.