Hi everyone, I want to purchase my first Hermes enamel bracelet. I know which one I want, but my question is - do the bracelets come in different sizes? I went to the Hermes website and it didn't ask me to pick a size. Someone on eBay is selling one in size GM and PM. I am not sure what this means. Can someone point me to where I can find out this info? I greatly appreciate anyone's help! Thank you.