diff --git a/include/constants/hold_effects.h b/include/constants/hold_effects.h
index 54406d9614..7a506bb8d2 100644
--- a/include/constants/hold_effects.h
+++ b/include/constants/hold_effects.h
@@ -107,6 +107,7 @@
 #define HOLD_EFFECT_ASSAULT_VEST   117
 #define HOLD_EFFECT_BINDING_BAND   118
 #define HOLD_EFFECT_DRIVE          119
+#define HOLD_EFFECT_GEMS           120
 
 // Gen6 hold effects
 #define HOLD_EFFECT_FAIRY_POWER    129