Deepslate Emerald Ore is a rare variant of emerald ore found in deepslate and tuff layers, generating exclusively in mountain biomes. It must be mined with an iron pickaxe or higher; otherwise, it drops nothing. Without Silk Touch, it drops 1 emerald, with Fortune increasing the yield (up to 4 with Fortune III) and granting 3–7 experience points.
Deepslate Emerald Ore is the rarest ore in Minecraft, generating only at low altitudes in specific biomes. When smelted, it produces an emerald. Placing it under a note block creates a 'bass drum' sound.