Q:

How can I tell if a ring is made of platinum?

A:

Quick Answer

The most reliable way to determine whether or not jewelry is platinum it to take it to a certified refiner. Refiners have access to a non-destructive technology to identify elements and determine concentrations of elements present in metal items. Often times refiners will provide free quotes on this service when contacted.

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Full Answer

One way to get an accurate answer without a refiner is checking the assay marking. This may require a magnifying glass or jeweler’s loupe. The most common assay markings and purity levels for platinum are:

  • Plat (Varying purity)
  • Pt (Varying purity)
  • 880 (88 percent pure)
  • 900 PLAT (90 percent pure)
  • 950 PLAT (95 percent pure)
  • 10% IRID 90 percent PLAT (90 percent pure, with 10 percent iridium)
  • On a ring, the assay marking will be stamped on the inside, along the shank. If an assay marking isn't present, a refiner will be necessary to determine the element and purity.

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