it is not adjustable, I would say fits a med, would be loose like a bracelet for small. too small for a large wrist. if you have a soft tape measure, or measure some string to 7 inches and try that on your wrist.
looked at it with a magnify glass and there is one little scratch on the bottem, that I cant see with the naked eye. but I did discover it has 4 diamonds on the face. not sure they are real though