OHMYGOODNESS will you look at these lockets!  Perfect little spheres of gorgeousness!  The little bronze balls open to reveal space for two 12mm photos inside.  So cute! The external diameter is approximately 16mm, and they have a 1.5mm ring at the top.

A quick recce around the office reveals these are inspiring sports themed or Harry Potter golden snitch jewellery! 

Available in bronze plated finish.