Water Stone Shard
From Pixelmon Wiki
A water stone shard is a piece of the water stone, an evolution stone used to evolve certain Water-type Pokémon.
Water stone shards is obtained from water stone ore, which can be found on the ocean floor. The ore looks like sand with blue waves in it. When mining or looking for these, it is advisable to bring a couple of signs. When stacked on top of each other, air blocks are created, allowing the player to breath and making it easier to see the ore. The ore is easy to spot, as it gives off some light.
Nine shards are needed to craft one water stone.