Composite ItemModel

A Composite ItemModel, is a list of ItemModels that should be layered over eachother. Recommend to check the Minecraft Wiki for an always up-to-date list.

Below is an example for showing an Item with a Model background

custom_diamond:
  ItemModel:
    type: composite
    models:
      - type: model
        model: namespace:custom_diamond
      - type: model
        model: namespace:background

You can also chain these to use different ItemModel-types inside each composite-entry here for very complex items