Engagement ring with tiny slide and projection lens built in

This engagement ring with a built-in lens and slide is apparently a prototype produced by an unnamed Polish manufacturer. According to Technolog, who posted the images to Reddit, the publicity-shy manufacturer hasn't gone into production yet.

Update: Technolog has updated the post with the name of the maker: Marek Mazur of Gdansk

Engagement ring with little photo slide and lens in it (via Super Punch)