Platinum is one of the rarest metals on Earth. It is often traded in ingot, bar or in coin form. 

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Jewelry is also made from platinum, containing anywhere from 85% to 95% platinum. Jewelry may be marked as "Pt" or as "Plat". For example, a piece of jewelry containing 90% platinum will be marked, 900 Pt or 900 Plat.

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If you're jewelry is simply marked "platinum", it is at least 95% pure (950 Plat).

Other jewelry may also be marked "platinum" if it contains at least 95% of platinum group metals. If this is the case, it must contain at least 50% pure platinum. The other platinum group metals and their percentages must also be marked. These metals may include iridium (Ir or Irid) and Palladium (Pall).