With a proper Seed, you can grab the most Diamonds in locations you might have never thought of. The first seed you can try is -974562123, which will take you inside a Ravine. Here, although you need to be careful so you do not fall down, there are a bunch of diamonds to grab. Another seed is -6959476951899901279, which will take you to a sinkhole where you can easily find more than five diamonds.