Gem Lock

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Gem Lock
Stack digit 9.pngStack digit 9.png
Amethyst Gem Lock.png Topaz Gem Lock.png Sapphire Gem Lock.png

Emerald Gem Lock.png Ruby Gem Lock.png Diamond Gem Lock.png Amber Gem Lock.png
Type FurnitureMechanism
Placeable Yes
Dimensions 3 wide ˣ 3 high
Use time 14 (Very Fast)
Rarity Rarity Level: 0
Sell 1 Silver Coin
Internal Item ID: 3644-3650
Internal Tile ID: 440
Desktop Version Desktop-Only Content: This information applies only to the desktop version of Terraria.
Placed Gem Locks, in both their on and off states.

A Gem Lock is a special mechanism which acts as a container or altar for a Large Gem. A Gem Lock will emit an activation signal if the corresponding Large Gem is placed inside it and once again if it gets removed. This allows for a simple contraption that uses only one mechanism to keep something like a door open as long as the gem is inside the lock because if it gets taken out it will immediately close.

Crafting[edit | edit source]

Recipes[edit | edit source]

Result IngredientsCrafting Station
Amethyst Gem Lock.png
Amethyst Gem Lock
Sell: 1 Silver Coin
Internal Item ID: 3648
Amethyst.pngAmethyst (5) Heavy Work Bench.png Heavy Work Bench Desktop VersionConsole VersionMobile only.pngOld-gen console version
Stone Block.pngStone Block (10)
Topaz Gem Lock.png
Topaz Gem Lock
Sell: 1 Silver Coin
Internal Item ID: 3647
Topaz.pngTopaz (5)
Stone Block.pngStone Block (10)
Sapphire Gem Lock.png
Sapphire Gem Lock
Sell: 1 Silver Coin
Internal Item ID: 3645
Sapphire.pngSapphire (5)
Stone Block.pngStone Block (10)
Emerald Gem Lock.png
Emerald Gem Lock
Sell: 1 Silver Coin
Internal Item ID: 3646
Emerald.pngEmerald (5)
Stone Block.pngStone Block (10)
Ruby Gem Lock.png
Ruby Gem Lock
Sell: 1 Silver Coin
Internal Item ID: 3644
Ruby.pngRuby (5)
Stone Block.pngStone Block (10)
Diamond Gem Lock.png
Diamond Gem Lock
Sell: 1 Silver Coin
Internal Item ID: 3649
Diamond.pngDiamond (5)
Stone Block.pngStone Block (10)
Amber Gem Lock.png
Amber Gem Lock
Sell: 1 Silver Coin
Internal Item ID: 3650
Amber.pngAmber (5)
Stone Block.pngStone Block (10)

Notes[edit | edit source]

  • The Gem Lock is the only craftable mechanism that emits a signal, while not having wire in the recipe.
  • Painting the Gem Lock will also affect the color of the gem placed inside it.
  • The Gem Lock only sells for 1 Silver Coin, despite the ingredients being worth more.

Trivia[edit | edit source]

History[edit | edit source]

Desktop VersionDesktop version

Tools Wire • Wrenches • Wire Cutter • Desktop Version Multicolor Wrench • Desktop Version The Grand Design • Desktop Version Actuation Rod
Accessories Desktop Version Mechanical Lens • Desktop Version Presserator
Triggers Lever • Switch • Pressure Plates • Timers • Desktop VersionConsole Version Detonators • Desktop Version Trapped Chests • Gem Locks
Devices Active/Inactive Stone Block • Actuator • Desktop Version Announcement Box • Pumps • Teleporter • Functional Statues • Light sources • Desktop VersionConsole VersionMobile only.pngOld-gen console versionGemspark Blocks
Traps Dart • Super Dart • Spear • Spiky Ball • Flame • Explosives • Desktop Version Geyser
Furniture: Iron Anvil.png Crafting Stations • Candle.png Light Sources • Chest.png Storage Items • Pure Water Fountain.png Other Items
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