Comments for Platinum Marking Query

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P in Circle & Testing Platinum
by: Yvonne

P in a circle mark could actually be the maker's mark. Irving M. Planick, 6 Maiden Lane, New York City.

About Platinum:
Platinum is a white color, similar to white gold, HOWEVER, platinum will have a slight greyish tone. This beautiful metal was very popular in the early 1900's through the 1930's. Platinum is heavier than gold and more expensive. Usually a combination of 90% platinum and 10% iridium is used in jewelry.

Some platinum marks include:
plat 10% irid
950 Pt is the Italian mark for Platinum.

Do not confuse with Mexican silver. Some Mexican silver will be marked 950.

Testing Metal for Platinum:

The weight is often a good indicator.
To confirm this use a touchstone and a platinum solution. If the acid does not dissolve the mark on the touchstone the piece is platinum. Your local jewelry can also test metal content.

Although we do not have a photograph, it certainly sounds like a beautiful heirloom engagement ring you have acquired. Thank you for writing in to us....
Yvonne Hammouda-Eyre
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