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I've done quite a bit of research on jewelry hallmarks and this one has been quite difficult. The only rhomboid hallmarks I could find are for English platinum, please see link below. There are some maker's marks that have something inside a rhomboid. If there is an animal or number inside the rhomboid then please pass that information on. In my experience it is most likely a maker's mark from a small jeweler.

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11y ago

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Continue Learning about Geometry

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