mc_rebalance/data/tconstruct/recipes/smeltery/casting/diamond/smithing_template.json

{
  "type": "tconstruct:table_duplication",
  "cast": [
    {"tag": "minecraft:trim_templates"}
  ],
  "cooling_time": 186,
  "fluid": {
    "amount": 100,
    "tag": "tconstruct:molten_diamond"
  }
}