I believe you were xray mining because:
- You have 126 Diamond ore blocks in about a 24 hour period
- You dig in straight lines to said diamond ore
- You neglect all other ores in the path of the diamond
- You don't use a light source while mining.
Even if you were extremely lucky, finding 126 diamond is a very high amount. If you can suggest a plausible explanation as to how I could be mistaken, I'll be happy to take your appeal into consideration.