Deepslate Diamond Ore is a deepslate variant of diamond ore, generating in deepslate and tuff layers at lower altitudes. It must be mined with an iron pickaxe or higher; otherwise, it drops nothing. Without Silk Touch, it drops 1 diamond, with Fortune increasing the yield (up to 4 with Fortune III).
Deepslate Diamond Ore is more common than regular diamond ore due to its increased generation in deeper layers. When smelted, it produces a diamond. Placing it under a note block creates a 'bass drum' sound.