1758 AR is the trademark/hallmark of the factory in Italy that made that piece of jewelry. 1758 is the number of the factory and AR stands for Arezzo, the city in Italy.
The Hallmark, Gilbert Marks....london 1861- 1905
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Not quite sure what your asking but hallmark is a company that makes different cards (I'm sure you know) but a hallmark can also mean
ar
ar = on
It means that its 2500
Fake gems
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Date stamp of 1890
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