The Mourner Pottery Sherd is a decorative ceramic fragment introduced with Minecraft 1.20's archeology system. Mourner Pottery Sherd is recovered exclusively by using a brush on suspicious gravel blocks inside cold ocean ruins, the submerged structures that generate in cold, frozen, and lukewarm deep ocean biomes. Mourner Pottery Sherd cannot be crafted, traded, or duplicated — brushing is the only source.

The design pressed into Mourner Pottery Sherd depicts a kneeling figure with bowed head and lowered shoulders, a posture commonly read as grief or remembrance. Mourner Pottery Sherd shares the cold ocean ruins loot pool with three sibling sherds — Blade, Explorer, and Plenty — so a single ruin dive can return any of the four. To build a Decorated Pot, place four ingredients (any combination of sherds and plain bricks) in a plus shape around the empty center slot of the crafting grid; each of the pot's four faces then shows the design from the piece placed in the matching slot, while brick slots stay blank. Breaking the finished pot bare-handed returns the whole item, while breaking it with any tool shatters it back into the four original ingredients, so Mourner Pottery Sherd can be recovered and reused indefinitely.