You broke 2 rules, building within 100 blocks of someone's claim/build and also x-raying. You broke the first one multiple times, and Brian was nice enough to not ban you (3 offences, to be exact). X-raying is just dumb. It's against the rules, and plus, diamonds were put into the game as a reward of mining, not a reward of downloading an x-ray resource pack. Personally, I wouldn't unban you either.
-OPwrecker