| Name | Elemental Gem, Emerald |
| Type | W |
| Magic item | Yes |
| Rarity | uncommon |
| Text | This gem contains a mote of elemental energy. When you use an action to break the gem, a water elemental is summoned as if you had cast the conjure elemental spell, and the gem's magic is lost. Source: Dungeon Master's Guide p. 167 |