Sephardic unisex ring carved with a drawing of a 5th century Spanish jewish sink hallmarked 925.
Handcrafted adjustable silver unisex ring carved with a drawing of a washbasin from Tarragona, Spain, AD 5. You see two peacocks, a tree of life, a candlestick with seven arms and a ritual horn. Packed in a trendy box for gifts. About 1 cm wide. two sizes available. both adjustable: A: N, the B: S 1/2.

I attach a comparison size table for different countries.