Recoloring gems/jewelry custom content help

So sometimes I like to recolor mods just for myself, I never post them anywhere but still make sure recolors are allowed and while I've done okay so far I'm now on a ring that I don't know what to do with. I'm lost on the template and don't know how to change specific gems on it to different colors and completely lost in blender. Do I need to retexture it in blender to assign certain colors to each gem, and if so how, or do I do it in sims 4 studio with the diffuse map somehow?



Working with this ring: www.thesimsresource.com/downloads/1668247 trying to make the gems on the main ring a different color. Any help would be greatly appreciated!