diff --git a/Resources/Prototypes/Reagents/Materials/materials.yml b/Resources/Prototypes/Reagents/Materials/materials.yml
index 9d8484e9f0..42ae9ba4b7 100644
--- a/Resources/Prototypes/Reagents/Materials/materials.yml
+++ b/Resources/Prototypes/Reagents/Materials/materials.yml
@@ -105,7 +105,7 @@
   name: materials-cotton
   unit: materials-unit-boll
   icon: { sprite: Objects/Materials/materials.rsi, state: cotton }
-  color: "#cccccc" 
+  color: "#cccccc"
   price: 0.01 #Who knew cotton was infinitely more valuable than silk
 
 - type: material
@@ -135,6 +135,7 @@
 
 - type: material
   id: Diamond
+  stackEntity: MaterialDiamond1
   name: materials-diamond
   unit: materials-unit-piece
   icon: { sprite: Objects/Materials/materials.rsi, state: diamond }