(Children's?) Movie where a man turns another man's heart into stone

Question

My fiance watched a movie when she was a child that involved a man with a glove who turned another man's heart into stone. She's pretty sure that it was a movie from the 1980s.

"Apparently, it was a fantasy-themed movie and the main character was a boy somewhere between 12 and 14 years old."

"Some bad guy had usurped... something. And he had control over a lot of people because he had a glove that would turn people's hearts into stone."

We spent a fair bit of time searching, but the key terms are far too common for us to find anything on Google. Any help with the title or director or something would be appreciated.

Answer 1

I wonder if you're thinking of the movie Mio in the Land of Faraway (1987) which is a fantasy with Nick Pickard as Mio / Bosse (left) and Christian Bale as Jum-Jum / Benke in the lead roles:

From Wikipedia

From a whispering well, Mio learns that an iron-clawed knight from the Land Outside, Kato (Christopher Lee), has been kidnapping children and making them his servants by ripping out their hearts and replacing them with stone.

I know it says ripping, but IMDb says it got a Universal rating, which means this definitely wasn't shown on-screen and maybe either your fiancée or whoever wrote the summary assumed incorrectly from whatever is mentioned.