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Jewelry, Gems, & Minerals/question about ring


I resantly got a engagement ring for my gfriend and it's stamped 925 1/20 PT was wondering what it means

Dear Ricky,

The mark you indicate is confusing and does not match quality marks for jewelry recognized in the United States.  This US Regulations do not not hold true for all countries but I do know your marking is also is not a legal marking in Great Britain.  For rundown of legal markings in the USA please go here:

That is the National Gold and Silver Marking Act.  This is a document of Federal regulations and, yes, it does read like a legal document.

Normally, 925 is the stamp for sterling silver. However the 1/20 PT seems totally out of place and is more like a mark associated with an overlay or "filled" metal like gold filled. If so, part of the mark is missing unless this is some quire peculiar sterling item with a 1/20 by weight overlay of platinum(from the PT).

Surely the seller of the ring will be able to tell you what it is made of and verify the markings. Otherwise, I  am left to speculate and speculation is not very helpful for an answer. If you have any other pertinent information, please use a follow-up to let me know,  Otherwise, I am not to provide a more accurate answer with out physically having he ring in hand to test.

Thanks for the question. Sorry the answer is not forthcoming.  God Bless and peace. Thomas.  

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Have a question about jewelry repair or working with precious metal jewelry and gemstones? For many years up to December 31, 2010, I was a working professional bench jeweler, involved everyday with setting stones in mountings, designing and making jewelry, repairing and limited custom manufacture. If you work with jewelry as a hobby or as a profession, I might be able to help. I deal with the retail business, not mass production. Ask privately if you wish. See the box for that: It keeps your question between us. Please DO NOT ask MAKER'S MARKS, but metal quality marks are fine to ask. Please DO NOT ask diamond prices. See a gemologist for that.


I have extensive experience in design, service and making of jewelry. I deal mostly with precious metals and gemstones but work with many materials as needed and usable to create an artistic design. My experience also includes freelance photography and photographer of jewelry and similar items for a former employer and individuals. Design of custom items requires reading the desires of the client and being clear on what can be done within that framework...then fulfilling the transition of idea to reality. Effective communications is essential in a working designer/producer and customer relationship.

Education is English/Physics! Started in human resources, to advertising, to, what a road. I have had formal training in jewelry work and many shared experiences with top grade jewelers. We just never know were we will go or be. Follow your best, your dreams, with some discretion! Don't let the work tear up your body along the way as it has mine.

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