How do I get rid of stains

Been using this sapphire cup for a few weeks and I can’t seem to get rid of the ros stain. Ive tried iso soaking, I’ve also tried torching in few areas. Is it possible to remove the stain

Been using this sapphire cup for a few weeks and I can’t seem to get rid of the ros stain. Ive tried iso soaking, I’ve also tried torching in few areas. Is it possible to remove the stain