diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/mining/Rock.java b/runelite-client/src/main/java/net/runelite/client/plugins/mining/Rock.java
index 1ee5ccf736..4f8cf9b32f 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/mining/Rock.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/mining/Rock.java
@@ -92,7 +92,7 @@ enum Rock
 	ORE_VEIN(Duration.of(MiningRocksOverlay.ORE_VEIN_MAX_RESPAWN_TIME, GAME_TICKS), 150),
 	AMETHYST(Duration.of(125, GAME_TICKS), 120),
 	ASH_VEIN(Duration.of(50, GAME_TICKS), 0, ASH_PILE),
-	GEM_ROCK(Duration.of(100, GAME_TICKS), 0, ROCKS_11380, ROCKS_11381),
+	GEM_ROCK(Duration.of(99, GAME_TICKS), 0, ROCKS_11380, ROCKS_11381),
 	URT_SALT(Duration.of(9, GAME_TICKS), 0, ROCKS_33254),
 	EFH_SALT(Duration.of(9, GAME_TICKS), 0, ROCKS_33255),
 	TE_SALT(Duration.of(9, GAME_TICKS), 0, ROCKS_33256),