[TheDutyPaid]

Now lets go back a bit, as far as I can see you have not explained this.



This was already in a large cave, no one else had mined in the area, and you was not continuing or did not continue mining.
You mined into a wall of deep slate right in front  of diamonds, mined the diamonds and then to another patch of diamonds.

Now I have started lots of tunnels and have been very lucky but I have never stopped moved only a few blocks and started mining again and then been really lucky