|Release date||3 April 2017 (Update)|
|Main music||Gemstone Dragons|
|Strongest monster||Dragonstone dragon, onyx dragon and hydrix dragon|
The gemstone cavern is located beneath the Shilo Village mining site, to access it the player must speak to Kelhar in the underground part of the mine. He will only allow the player to access the dungeon if they have a gemstone dragon Slayer assignment or if they pay him with incomplete hydrix, onyx or dragonstone gems.
Dragonstone dragons, onyx dragons and hydrix dragons, which require 95, 98 and 101 Slayer to kill, are found in the dungeon. It also contains gem rocks. There is an agility shortcut at the entrance in the gemstone dragon dungeon, requiring 94 Agility in order to use. The shortcut leads to the hydrix dragons.