You know 21 diamonds in 10 minutes? IMPOSIBRU!!!!
First lets set the counter of finding the first diamonds. That clearly could take a while, but if, IF you are lucky, you will find in 1 minute, so 1 minute to find diamonds, (around 5-6, or even 7 in one chunk), you have to spend time digging, if you go in one direction, diamonds might be under you or on top, if you go to the right or left again, the chance on running on diamonds so close together is like 20% chance.
Even if you did found another chunk, it would of taken you about 10 minutes and you would only have about 11 or max 13 diamonds.
It is easy to spot if you were using xray, you probably have digged down, left and right, basically in a chaotic way, due to your xray, I know that, because I wanted to see what it does and ye, in 10 minutes, you could easily get 20+ diamonds.
Anyhow, that's not the reason for you to leave. I mean you talk about CS, but then you say in your sentence, kasabi feed my chickens...