Ancient Debris:
In Java Edition, up to two clusters may generate per chunk: one cluster of 0–3 ancient debris attempts to generate with a triangle distribution from levels 8 to 24, and an additional cluster of 0–2 ancient debris attempts to generate evenly from levels 8 to 119. On average, Y-level 16 has the most ancient debris. There is an average of 1.65 ancient debris blocks per chunk[needs testing], with a normal maximum of 5. However, it is technically possible for up to 11 ancient debris to be found in a single chunk; adjacent chunks can generate blobs on the border with up to 2 blocks spawning in an adjacent chunk. As of Java Edition 1.16.5, on average they generate 1.56 ores per chunk. Given this number, and that there are 32768 blocks in a chunk (16×128×16), there is approximately a 0.004% chance that any randomly selected block will be an ancient debris block.
Diamond:
### Diamond ore can be mined using an iron pickaxe or stronger. An ore drops a single diamond. If mined by any other tool, it drops nothing. If the pickaxe is enchanted with Fortune, it can drop an extra diamond per level of Fortune, allowing for a maximum of 4 diamonds with Fortune III. If the ore is mined using a pickaxe enchanted with Silk Touch, it drops an ore block rather than a diamond. The ore is found at level 15 or lower, most commonly between -50 and -64; levels -58 and -59 are the preferred levels to mine at since they don't contain bedrock, as it starts spawning at -60.
Ancient Debris:
In Java Edition, up to two clusters may generate per chunk: one cluster of 0–3 ancient debris attempts to generate with a triangle distribution from levels 8 to 24, and an additional cluster of 0–2 ancient debris attempts to generate evenly from levels 8 to 119. On average, Y-level 16 has the most ancient debris. There is an average of 1.65 ancient debris blocks per chunk[needs testing], with a normal maximum of 5. However, it is technically possible for up to 11 ancient debris to be found in a single chunk; adjacent chunks can generate blobs on the border with up to 2 blocks spawning in an adjacent chunk. As of Java Edition 1.16.5, on average they generate 1.56 ores per chunk. Given this number, and that there are 32768 blocks in a chunk (16×128×16), there is approximately a 0.004% chance that any randomly selected block will be an ancient debris block.
Diamond:
### Diamond ore can be mined using an iron pickaxe or stronger. An ore drops a single diamond. If mined by any other tool, it drops nothing. If the pickaxe is enchanted with Fortune, it can drop an extra diamond per level of Fortune, allowing for a maximum of 4 diamonds with Fortune III. If the ore is mined using a pickaxe enchanted with Silk Touch, it drops an ore block rather than a diamond. The ore is found at level 15 or lower, most commonly between -50 and -64; levels -58 and -59 are the preferred levels to mine at since they don't contain bedrock, as it starts spawning at -60.