minecraft-assets/assets/minecraft/advancements/recipes/buildingBlocks/emerald_block.json

{
  "rewards": {
    "recipes": [
      "minecraft:emerald",
      "minecraft:emerald_block"
    ]
  },
  "criteria": {
    "has_at_least_9_emerald": {
      "trigger": "minecraft:inventory_changed",
      "conditions": {
        "items": [
          {
            "item": "minecraft:emerald",
            "count": {
              "min": 9
            }
          }
        ]
      }
    },
    "has_the_recipe": {
      "trigger": "minecraft:recipe_unlocked",
      "conditions": {
        "recipe": "emerald_block"
      }
    }
  },
  "requirements": [
    [
      "has_at_least_9_emerald"
    ],
    [
      "has_the_recipe"
    ]
  ]
}