Yo-Yo holder how-to question

So i made my new Yo-Yo holder yesterday, but I want to make it like this http://yoyoexpert.com/blog/the-lockett-clasp-yo-yo-holder/

Does anyone have an idea how to make it like this or the name of that design so I can do some further research on it?

Any advise would be greatly appreciated. Thanks in advanced.