This pendant depicts the combadge worn by the crew of the USS Enterprise in Star Trek - The Next Generation. You will, of course, need to source the neck chord.
If you don't have a 3D Printer and you want one of these produced, please send me a DM and we can arrange for me to print one for you :)
Or you can order one, complete with the cord, made to order in my Etsy store - www.etsy.com/uk/shop/enterprisexddesign