Zakat on Silver rings
In the name of Allah, the most Beneficent, the most Merciful.
It should be understood that Zakat is only obligatory upon gold and silver jewellery. Precious stones such as pearls, rubies, and diamonds are exempt from Zakat. (Aapke Masaail p.365 v.3)
With regards to your question, Zakat on mixed articles like gold or silver mixed with other alloys are determined by the overpowering of metal. If one has gold or silver mixed with other metals and the gold or silver is more than 50% of the total article, zakat will be necessary. (Fatawa Mahmoodiyah p.71 v.3)
Only Allah Knows Best
Mohammed Tosir Miah
Darul Ifta Birmingham