Question: What does the stamp “Plat Furo” mean inside my engagement ring? From Kathryn in Danbury, CT

Sterling Silver RingAnswer:

With the price of platinum rising above the price of gold, this precious metal is the commodity of the week! So thanks for your question about your platinum ring.

Though there are not as many hallmark variations for platinum jewelry as gold and silver, when deciphering platinum hallmarks you still must take in to account the purity, time period, manufacturer and place of origin for your piece.

“Plat” obviously means platinum, however we’re not sure what “Furo” means next to it. Are there any other markings? We would be looking for a number that indicates the purity/grade of your platinum ring. Below are some common markings we see:

850 (85% Platinum)
900 (90% Platinum)
950 (95% UK Standard Platinum)
999 (99.9% Pure Platinum)

If your ring is new, I would think that it would have one of these common platinum markings. If it does not have one of those, you may want to have a jeweler look at it for purity. While most of our platinum posts are about industrial platinum refining, here are a few about platinum jewelry that may help also:

*Images displayed are only a representation of the items described in this blog post and may not be true images of the items in question.

While we are happy to give estimates on precious metal items, we are NOT antiques dealers, researchers, or retail sellers. As a precious metal refiner, we only consider the weight and amount of precious metal available to extract during the smelting and refining process.