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Gem rocks are a unique type of rock that yield gems, rather than ore, when mined. 40 Mining is required to mine these rocks. Gem rocks take about a minute and twenty five seconds to respawn, though the rate changes depending on how many players are connected to the server. When all nearby rocks have been mined, players can hop worlds to get access to unmined rocks. The chance of mining an additional ore while wearing Varrock armour does not apply to gem rocks.

The gem received is random, so rocks are not bound to specific gems, except for the rocks found during The Tale of the Muspah. It is rare to receive more expensive gems such as rubies and diamonds with the exception of the Shilo Village ones. Gems are mined at a faster rate while wearing a charged amulet of glory and ring of wealth. Wearing a ring of wealth also gives a small chance to get two gems from one rock (a message will appear when this occurs).

A popular technique when mining these rocks is to bring a chisel and cut and fletch the gems into bolt tips, thus reducing the need to bank. The gem rocks can also be used with the gem bag reward from Dungeoneering.

Locations

Shilo Village

After completing the Shilo Village quest, access to the gem rocks is obtained. Additionally, the underground gem mine can be accessed after completing hard tasks of Karamja Diary.

Based on a sample of 1000 consecutively mined gems at Shilo Village with a Bane +4 Pickaxe and no luck modifiers (as of November 12th, 2019), the chance of mining each type of gem is as follows:

Gem type Approx. chance GE price (uncut)

GE price (cut)

Uncut emerald 50% 775 333
Uncut ruby 30% 1,223 309
Uncut diamond 20% 2,682 747

Based on the above table, this means on average the player will earn an average of 80.4 Crafting experience per rock mined. This makes the Shilo Village a very useful location for IM and HCIM.

Lunar Isle

After completing Lunar Diplomacy, players gain access to three gem rocks within the Lunar Isle mine.

Based on a sample of 250 consecutively mined gems at Lunar Isle mine, with a Ring of Wealth and a Dragon Pickaxe (as of March 14th, 2018), the chance of mining each type of gem is as follows:

Gem type Approx. chance GE price (uncut)

GE price (cut)

Uncut opal 40.82% 125 135
Uncut jade 26.94% 402 498
Uncut red topaz 13.47% 241 310
Uncut sapphire 6.12% 411 185
Uncut emerald 4.90% 775 333
Uncut ruby 3.67% 1,223 309
Uncut diamond 4.08% 2,682 747

Al Kharid

The Al Kharid mining site resource dungeon requires a Dungeoneering level of 75 to access. There is little competition due to the high requirement. Seven gem rocks are here as well as lower level implings that can be caught while waiting for rocks to respawn.

Based on a sample of 501 consecutively mined gems at the Al Kharid Resource Dungeon with a rune pickaxe, the chance of mining each type of gem is as follows:

Gem type Approx. chance GE price
Uncut opal 51.1% 125
Uncut jade 24.6% 402
Uncut red topaz 9.6% 241
Uncut sapphire 5.8% 411
Uncut emerald 4.2% 775
Uncut ruby 2.8% 1,223
Uncut diamond 2.0% 2,682

Based on the above table, this means on average the player will earn 330.18 per rock mined, or an average of 25.25 Crafting experience and 2.5513 Fletching experience should the player decide to create bolt tips, assuming no gems are accidentally crushed.

Prifddinas

The 8 Prifddinas gem rocks, found within the Trahaearn district, yield different gems than other gem rocks found in RuneScape. Unlike the other rocks, they do not contain uncut opal, jade and red topaz, but instead offer uncut gems up to onyx and spirit gems up to dragonstone. With a crystal pickaxe, a player can expect to mine about 336 gems per hour. With a crystal pickaxe and a charged glory, a player can mine around 600 gems an hour instead.

Based on a sample of 11,771 mined gems at the Prifddinas gem rocks with a rune pickaxe, the chance of mining each type of gem is as follows:

Gem type Approx. chance GE price
Uncut sapphire 48.42% 411
Uncut emerald 28.27% 775
Uncut ruby 8.97% 1,223
Uncut diamond 3.79% 2,682
Uncut onyx 0.08% 1,313,608
Spirit sapphire 5.78% N/A
Spirit emerald 2.93% N/A
Spirit ruby 1.24% N/A
Spirit diamond 0.39% N/A
Spirit dragonstone 0.11% N/A

Based on the above table, this means on average the player will earn 1,504.74 coins per rock mined

Daemonheim

Main article: Kal'gerion gem rock

The Kal'gerion dungeon requires a Dungeoneering level of 90 to access. It contains ten Kal'gerion gem rocks, which give slightly more experience than regular gem rocks, and are the only rocks to contain uncut dragonstone.

Based on a sample of 1,000 consecutively mined gems at the Kal'gerion 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% 125
Uncut jade 21.8% 402
Uncut red topaz 9.9% 241
Uncut sapphire 16.2% 411
Uncut emerald 12.6% 775
Uncut ruby 5.4% 1,223
Uncut diamond 3.3% 2,682
Uncut dragonstone 1.9% 12,448

The expected value is 2,002.03 as of 18 Feb 2018

Tai Bwo Wannai Cleanup

Cleanup gem rock

A gem rock found during Tai Bwo Wannai Cleanup

Gem rocks can be found randomly while hacking jungle in the Tai Bwo Wannai Cleanup minigame. When a player discovers one, a message will appear saying: "The jungle parts to reveal a gem-rich rock". These rocks have gems encrusted on the surface, which disappear as the player mines it. The rock may be mined three times before disappearing. The colours of these gems are not an indication of which gems the player will actually mine.

The Tale of the Muspah

During The Tale of the Muspah there are gem rocks that contain only sapphires, no experience is gained from these rocks and they cannot be mined again.

Explorer's aura

Gem rocks can appear in resource dungeons reached through the explorer's aura's portal. However, the aura was removed from the game after an update.

Trivia

  • When a gem rock is mined, the sound made when redeeming an experience lamp is played.
  • One of the Prifddinas gem rocks displays a yellow gem, despite there being no mineable yellow gems in game.
  • In the first week of release, gem rocks in Prifddinas gave a high percentage of summoning gems and uncut onyx.
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