The Minecraft Biome with 72 Diamonds PER CHUNK
https://www.youtube.com/watch?v=gdA8KjQV4Y8
There is ~1 diamond ore vein generated per chunk. An ore vein will have between 3 – 8 diamond ore in it. However, that vein can be overwritten by other generated structures – such structures, such as caves, can leave you with a chunk with no ore vein in it.