What? Um no. I gave my ex an expensive watch, the fanciest camera and its equipment when we were together. He gave me a phone and some nice jewelry. When we broke, NO ONE asked for ANYTHING back. Those things were given as a gift, not a loan or a promise. 

The ONLY thing that can be asked for back is a family heirloom. That’s it. 

Tell him he ain’t getting it back. It was gifted to you.