diff --git a/data/minecraft/worldgen/processor_list/fossil_diamonds.json b/data/minecraft/worldgen/processor_list/fossil_diamonds.json
new file mode 100644
index 0000000..f9be3e7
--- /dev/null
+++ b/data/minecraft/worldgen/processor_list/fossil_diamonds.json
@@ -0,0 +1,29 @@
+{
+  "processors": [
+    {
+      "integrity": 0.1,
+      "processor_type": "minecraft:block_rot"
+    },
+    {
+      "processor_type": "minecraft:rule",
+      "rules": [
+        {
+          "input_predicate": {
+            "block": "minecraft:coal_ore",
+            "predicate_type": "minecraft:block_match"
+          },
+          "location_predicate": {
+            "predicate_type": "minecraft:always_true"
+          },
+          "output_state": {
+            "Name": "minecraft:deepslate_coal_ore"
+          }
+        }
+      ]
+    },
+    {
+      "processor_type": "minecraft:protected_blocks",
+      "value": "#minecraft:features_cannot_replace"
+    }
+  ]
+}