For masters there’s just a tiny change to the actual look of the border and gold stars is kinda lame, diamond looks better. I guess purple is fine but the actual border should be changed more and look more detailed imo, with some designs at the top of it.
Also I think Red and black (with some fire animation?) would be a better idea for GM, with the stars being red. Since there is already a gold rank, the gold and red design doesn’t give off the vibe that it is the highest rank. When I started playing I thought that it was just gold players who have a high level or something lol.