I found 10 DIAMONDS, yes, 10. I thought only 9 could spawn, I looked it up on MinecraftWiki, and it was a double vein! 1 diamond and 9 diamonds in the same spot. When I went to the left, a skeleton knocked me onto a waterfall which led into lava. My keys stuck, so I grabbed the water source block with my water bucket. Being in a rush, I placed gravel, sand, dirt, and cobble to remove the lava. I hit the skeleton a few times, and killed him. When lighting a place up, I found an abandoned mine shaft. I made out with 3 stacks of iron, 7 diamonds, and 5 stacks of coal. When I went home, I went on the way up from the mountain I was in. Well, I misstepped from my cobblestone beam leading from mountain to mountain, and was left at half a heart. With no bed, I saw 2 skeletons. I had 2 hearts regen, jumping and jumping. I kept running and jumping, and they eventually died after me regenning. When I made a house, It started raining. I WAS STRUCK BY FREAKING LIGHTNING, I was so shocked. I did live, however. So, in my mining trip, I had lots of disaster, but I lived.
A good effort, but you are not the luckiest man alive. The luckiest man alive did all this well simultenously making love to two lesbians supermodels he had just met, then they found he was so talented a man in "bed" they invited 8999 additionnal lesbian supermodels to come over at his home (Which is extremely spacious, because he had previously won the lottery 7 times)
Then Morgan Freeman came by his house after he rested from the wildest night of his life and used his godly powers to make him eternally young along with all the lesbians supermodels, so they could go at it again for all eternity.
THAT is the luckiest man alive. Not to mention his father gave it a name fitting of his exploits.
Hate to break it to you, but you are not the luckiest man alive... a double vein of 10 diamonds is nothing. I remember about a month ago, I had started a new world and found a cave that had huge amounts of iron and coal. The cave led me to diamond layer, where I hit the jackpot and found 33 diamonds in around 10 minutes. I was literally running around in the cave and skyping my friend at the same time, saying "another vein of diamond..." every few minutes. I ended up with 8 stacks of iron plus the 33 diamonds by the time I had left the cave :).