Sorry to break the streak but…
I ended up essentially having to throw the game to ensure 2nd place. Yellow had a huge amount of gold and the other players weren’t trying to block him at all. I returned his prisoner to jail letting him end the game 2 turns earlier, so ensuring the other players didn’t have time to grab another gem. Not something I would normally do, but by that point there was no way I could take first, so I played for second instead