is there a way to boost the emissiveness of a material without changing out it looks?

I only want this stone to shoot more photons in the scene, light more, can't find a setting for it in the material, only way is to increase emissiveness which will change how it looks, maybe best is to have an object inside that does the emission in the lightmap?

 

I reduced the scene to 1m = 1 unit and cpu render, it's fine now.
gpu render really doesn't like the 2060 rtx, too bad because that thing is a best at tracing rays.