Short answer is yes. While they won't repair it in that particular store, they will help you send it to their service center. Repairs are usually completed and returned to you in 2 weeks.
Yes, my mother does it all time. See this link for more details. --> https://www.tiffany.com/faq/care-and-repair-faq/how-can-I-get-an-item-repaired/
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