Do your Coins and Gems search while you're actually in-game, the thing with Gems is you need to remember how many you have in hand before you start running, then play, then pause, search for that number (4-byte value), grab a gem, search again, grab another gem, then your search will be narrowed down enough to give you only a couple of values that you change them all to 99999. Die, use a gem to respawn, die, use another gem, then search to see which value has dropped and you'll know which address needs changing.