The width is 3/16 of an inch. The width of the band is 1/8 of an inch. The European ring size is 54. The American ring size is 6.5. The serial number is AST6M2.This is in great condition. We guarantee the authenticity of our pieces, as well as the stated condition and functionality of all items. The item "CHIC Bulgari 18k Yellow Gold & Ancient Roman Coin" is in sale since Wednesday, October 19, 2016. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Rings\Precious Metal without Stones". The seller is "dani-krak" and is located in Los Angeles, California. This item can be shipped worldwide.