What is the maximum amount of diamonds in one vein?

Recently I have started a survival world on Xbox 360. I immediately found a cave with around 24 diamonds. It was in a odd location with a 1 by 1 hole leading to the cave. It also had a dirt pillar that was about 10 dirt blocks high. This was kind of suspecting that somebody did it because I was in creative earlier and I left to do something. So I was wondering what the maximum amount of diamonds were possible or if that was just a person who placed it.

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4 Answers

Diamond ore appears in veins of 3-8. As said by the Minecraft wiki and also by personal experience.

Diamond ore only appears at Y level 16 and below, and can be found in veins of 3–8.

Source: Minecraft Wiki

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Due to how Minecraft vein generation works, it is possible to find veins with up to 10 diamonds even though the max vein size is 8.

I think the max is 10 because I found 10 in one vein and no one else other than me had access to my world on this seed, and I never went on creative on it before. It’s seed 777, Position: -1264, 10, 387

As the Minecraft Wiki stated in Meantub's answer:

Diamond ore attempts to generate 1 time per chunk in veins of 0-10 ore, in layers 1 to 16 in all biomes.

But, it is possible to find a much larger diamond vein than this, if multiple veins spawn directly beside each other on different chunks. This could result in a maximum of 40 diamonds in a single giant vein, if the veins generated in corners. But, this is highly unlikely to ever occur in game.