what does the stamp and abreviation mean on a ring 925 with a diamond shape mark mean

This is probably a silver ring- it means 92.5% silver content

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The 925
hallmark means that the ring is made from no less than 925 out of 1000 parts of
fine silver, meaning that it falls in the category of sterling silver.

The
diamond shape mark you are referring to is actually a French hallmark that was an
obligatory mark made on French silver, platinum and gold after the year 1838.

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