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A Kal'gerion gem rock is a unique type of gem rock in the Kal'gerion dungeon that yield gems, rather than ore, when mined. The player must have a level of 90 Dungeoneering to enter this resource dungeon, and will be granted 17,500 experience once entered for the first time. They are the only rocks to contain uncut dragonstone. At least 50 Mining is required to mine these rocks, and they grant 75 experience, regardless of the type of gem mined. The chance of mining an additional ore while wearing Varrock armour does not apply to gem rocks.

Based on a sample of 1,000 consecutively mined gems at Kal'gerion resource dungeon without a charged amulet of glory, the chance of mining each type of gem is as follows:

Gem type Approx. chance GE price
Uncut opal 28.9% 177
Uncut jade 21.8% 315
Uncut red topaz 9.9% 346
Uncut sapphire 16.2% 809
Uncut emerald 12.6% 2,555
Uncut ruby 5.4% 1,842
Uncut diamond 3.3% 4,843
Uncut dragonstone 1.9% 12,077
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