This is a vintage dove ring, perfect as a symbol of peace. This is an adjustable ring. The size is 30mm from tail to the beak and then 26 mm from wingtip to belly. That gives you a good approximation. These are suggested as holiday gifts or as bridesmaid gifts. But as there’s only one available, you’d have to limit giving it as just a maid of honor gift or something. A dove is also nice when used in Christmas jewelry.
This dove ring is available at Etsy.