{
  "type": "minecraft:smithing_transform",
  "base": {
    "item": "minecraft:golden_helmet"
  },
  "addition": {
    "tag": "forge:gems/diamond"
  },
  "result": {
    "item": "minecraft:diamond_helmet"
  },
  "template": {
    "tag": "forge:plates/gold"
  }
}