dropt rule

{
    "rules": [
      {
        "match": {
          "blocks": {
            "blocks": [
              "minecraft:diamond_ore"
            ]
          },
          "harvester": {
            "type": "PLAYER",
            "heldItemMainHand": {
              "type": "WHITELIST",
              "harvestLevel": "pickaxe;3;3"
            }
          }
        },
        "replaceStrategy": "ADD",
        "drops": [
            {
                "selector": {
                    "weight": {
                        "value": 20
                    }
                }
            },
            {
                "selector": {
                    "weight": {
                        "value": 80,
                        "fortuneModifier": 2
                    },
                "silktouch": "EXCLUDED"
                }
            },
            {
                "item":{
                    "items": [
                        "betterwithmods:material:45"
                    ]
                }
            }
        ]
      }
    ]
  }