The rings are marked S990, which is supposed to mean 99% pure silver from the jeweler's point of view, which is far-fetched because silver that is close to pure is not suitable for jewellery.
Well I have access to an XRF machine and they have tested Cu (Copper), Cd (Cadmium) and Ni (Nickel). Do not order if you have sensitive skin, are sensitive to heavy metals, or are expecting real silver.
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