Minecraft wiki entry for Amethyst_farming, associated text: What you need to do is dig out a large area if you are underground, and mine all of the blocks around the geode that are not budding amethyst. If you are over the ocean then you will need to mine out all of the blocks around the geode that are not budding amethyst as well, and wall off the area from the rest of the ocean using blocks or glass (in an underground environment you will need to block off all the caves). This is recommended if you don't want drowned to enter and the items to scatter when they float. Then you will need to flood the entire area with water (all blocks have to be water sources otherwise this method won't work, so do it layer by layer), and spread out the conduits so that you are able to get the conduit effect in every single water block in the whole area. If you are in an ocean biome then you will also need to light up the water. In one corner you can also place a soul sand block next to a magma block to make a bubble elevator and an even easier way to get to the surface and floor. To harvest all you need to do is swim down to the geode and harvest all the mature amethyst clusters. The drops will float to the surface of the water, so collecting the items is simple. The only downside to this farm other than the resources it needs is that the items can despawn if you don't pick them up after 5 minutes.