Minecraft wiki entry for Amethyst_farming, associated text: This method works best in an amethyst geode which is under an ocean, because you will do much less mining, clearing out and placing all the water, but this is an extremely easy and efficient method that can also work in an underground geode if you are willing to do all the tedious work required. This will not disrupt the growth of amethyst, since amethyst buds and clusters can be waterlogged and grow in water and are not affected by it.