{
  "type": "recipe",
  "crafter": "blacksmith_crafting",
  "inputs": [
    {
      "item": "gems:topaz_necklace"
    },
    {
      "item": "gems:sapphire_necklace"
    },
    {
      "item": "gems:ruby_necklace"
    }
  ],
  "intermediate": "minecraft:air",
  "min-building-level": 4,
  "result": "gems:gem_necklace",
  "show-tooltip": true
}