Can you (and if so how to) check if a specific item (entity) is burnt?

I want to make it so if a certain item is burnt, then it will do something, (in my specific case play a sound and give the player an achievement)

Is there a way to do this? The closest I've got is if the player is burning it will do it, and it doesnt let me use the source entity with the event (gem dropped), so I'm at a loss for what specifically to do