Do antique Tiffany and Co rings have serial numbers?

Yes, antique Tiffany & Co. rings typically have serial numbers, which can help authenticate their origin and age. These serial numbers are usually engraved on the inside of the band and can vary in format depending on the time period. However, not all older pieces may have them, as the practice of serializing jewelry became more common in later years. It's advisable to consult with an expert or appraiser for verification.