Most of my bracelets start a 7.5", although I do have a few that are shorter. If you see a bracelet that you would like to wear as an anklet that but it's too short, don't dispair.
My chain extensions are sterling silver and I will choose a chain that will be most suitable for the bracelet/anklet.
I charge $0.50 per half an inch of chain extensions. Change quantity on view cart page to how many half inches you want added.