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Crystal chest

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The crystal key chest is a treasure chest located in Ivy Sophista's house in Taverley. A second chest is located in Prifddinas in the Iorwerth section. The chests are locked and can only be opened by a crystal key. Attempting to open the chest without the crystal key yields the message: "This chest is securely locked shut." The crystal key is made up of a loop half of a key and a tooth half of a key; you can make the crystal key by using them with each other, or selecting the "Assemble" option. Opening a crystal chest grants a variety of rewards, which always include an uncut dragonstone. The crystal chest in Prifddinas grants slightly better rewards than the Taverley chest. The crystal key sells for more than most of the rewards, making it more monetarily satisfying to sell the key. When the key is used it disappears, so opening the chest is a gamble.

RewardsEdit

The chest loot always includes an uncut dragonstone, together with a random reward generated from 13 possible reward tables. Below are the values of the chest's contents, based on current Grand Exchange prices.

After an update, wearing a ring of wealth will increase your chances of getting a better drop. It is only possible to obtain rune platelegs if you are a male character, and a rune plateskirt if you are female character.

It is a common misconception that you can obtain a Crystal ward or a crystal bow from the chest. The chest does not contain either of these items, as they are a quest reward.

Possibilities - Taverley chestEdit

Possibility 1 - Fruit tree seedEdit

The expected value of Possibility 1 is Coins 1000 55,624, which is a profit/loss of Coins 1000 -15,172 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Calquat tree seed 5 Calquat tree seed 1 2 Common [1] 13,565
Papaya tree seed 5 Papaya tree seed 1 2 Common [1] 51,941
Palm tree seed 5 Palm tree seed 1 2 Common [1] 123,491
  1. ^ a b c With Possibility 1, you are guaranteed to get either a calquat tree seed, a papaya tree seed or a palm tree seed. Both the calquat and papaya tree seed have a probability of 5:11 (45.45%), and the palm tree seed has a probability of 1:11 (9%).
Possibility 2 - Lantadyme seedsEdit

The expected value of Possibility 2 is Coins 1000 66,810, which is a profit/loss of Coins 1000 -3,986 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Herb seed 5 Lantadyme seed 2 1 Always 52,188
Possibility 3 - Grimy torstolsEdit

The expected value of Possibility 3 is Coins 1000 25,524, which is a profit/loss of Coins 1000 -45,272 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Grimy torstol Grimy torstol 2 1 Always 10,902
Possibility 4 - RunesEdit

The expected value of Possibility 4 is Coins 1000 123,622, which is a profit/loss of Coins 1000 52,826 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Law rune Law rune 50 1 Always 21,900
Chaos rune Chaos rune 50 1 Always 2,500
Cosmic rune Cosmic rune 50 1 Always 13,050
Death rune Death rune 50 1 Always 14,750
Nature rune Nature rune 50 1 Always 15,400
Body rune Body rune 200 1 Always 10,800
Mind rune Mind rune 200 1 Always 3,200
Earth rune Earth rune 200 1 Always 4,400
Air rune Air rune 200 1 Always 5,600
Water rune Water rune 200 1 Always 5,400
Fire rune Fire rune 200 1 Always 12,000
Possibility 5 - Iron oreEdit

The expected value of Possibility 5 is Coins 1000 67,622, which is a profit/loss of Coins 1000 -3,174 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Iron ore Iron ore 200 (noted) 1 Always 53,000
Possibility 6 - CoalEdit

The expected value of Possibility 6 is Coins 1000 50,772, which is a profit/loss of Coins 1000 -20,024 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Coal Coal 150 (noted) 1 Always 36,150
Possibility 7 - Rune barsEdit

The expected value of Possibility 7 is Coins 1000 56,943, which is a profit/loss of Coins 1000 -13,853 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Rune bar Rune bar 3 1 Always 42,321
Possibility 8 - GemsEdit

The expected value of Possibility 8 is Coins 1000 40,002, which is a profit/loss of Coins 1000 -30,794 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Uncut diamond Uncut diamond 3 1 Always 16,650
Uncut ruby Uncut ruby 3 1 Always 8,730
Possibility 9 - Loop half of a keyEdit

The expected value of Possibility 9 is Coins 1000 63,476, which is a profit/loss of Coins 1000 -7,320 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Loop half of a key Loop half of a key 1 1 Always 33,854
Coins 1000 Coins 15,000 1 Always Not sold
Possibility 10 - Tooth half of a keyEdit

The expected value of Possibility 10 is Coins 1000 63,987, which is a profit/loss of Coins 1000 -6,809 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Tooth half of a key Tooth half of a key 1 1 Always 34,365
Coins 1000 Coins 15,000 1 Always Not sold
Possibility 11 - Rune platebodyEdit

The expected value of Possibility 11 is Coins 1000 52,808, which is a profit/loss of Coins 1000 -17,988 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Rune platebody Rune platebody 1 1 Always 38,186
Possibility 12 - Rune platelegs or plateskirtEdit

The expected value of Possibility 12 is Coins 1000 51,816 for male characters and Coins 1000 52,067 for female characters, which is a profit/loss of Coins 1000 -18,980 for male characters and Coins 1000 -18,729 for female characters, if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Rune platelegs Rune platelegs 1 2 Common [1] 37,194
Rune plateskirt Rune plateskirt 1 2 Common [1] 37,445
  1. ^ a b With Possibility 12, you are guaranteed to get either a rune platelegs or rune plateskirt. Male characters will always receive a rune platelegs, while female characters will always receive a rune plateskirt.
Possibility 13 - Dragonstone armourEdit

The expected value of Possibility 13 is Coins 1000 24,002,886, which is a profit/loss of Coins 1000 23,932,090 if buying the crystal key on the GE.

Receiving this possibility is very rare.
  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Dragonstone helm Dragonstone helm 1 2 Common [1] 17,581,693
Dragonstone hauberk Dragonstone hauberk 1 2 Common [1] 42,376,486
Dragonstone greaves Dragonstone greaves 1 2 Common [1] 26,343,729
Dragonstone gauntlets Dragonstone gauntlets 1 2 Common [1] 16,283,740
Dragonstone boots Dragonstone boots 1 2 Common [1] 17,355,673
  1. ^ a b c d e With Possibility 13, you are guaranteed to get exactly one piece of dragonstone armour. Each piece has the same probability of being received.

Possibilities - Prifddinas chestEdit

Crystal chest (Prifddinas)
Crystal chest (Prifddinas) location

Priffdinas chest location.

This chest was released with part 1 of Prifddinas on 22 September 2014 and is located in the Iorwerth Manor against the south wall. It has an improved drop table over the chest in Taverley. While the Voice of Seren is active for the Iorwerth clan, the chest provides an increased chance of Prifddinas-related items looted, including: corrupted ore, Crystal tree blossoms, and Crystal motherlode shards. At the least, the player should still wear a Ring of wealth when opening either crystal chest.

Possibility 1Edit

The expected value of Possibility 1 is Coins 1000 50,297, which is a profit/loss of Coins 1000 -20,499 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Grimy lantadyme Grimy lantadyme 5 1 Always 35,675
Crystal tree blossom Crystal tree blossom 1 1 Always Not sold
Possibility 2 - Tree seedsEdit
  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Yew seed 5 Yew seed 1 2 Common 74,732
Papaya tree seed 5 Papaya tree seed 1 2 Common 51,941
Elder seed 5 Elder seed 1 3 Uncommon 104,516
Possibility 3 - Tooth half of a keyEdit

The expected value of Possibility 3 is Coins 1000 48,987, which is a profit/loss of Coins 1000 -21,809 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Tooth half of a key Tooth half of a key 1 1 Always 34,365
Crystal motherlode shard Crystal motherlode shard 10 2 Common Not sold
Possibility 4 - Loop half of a keyEdit

The expected value of Possibility 4 is Coins 1000 48,476, which is a profit/loss of Coins 1000 -22,320 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Loop half of a key Loop half of a key 1 1 Always 33,854
Crystal motherlode shard Crystal motherlode shard 10 2 Common Not sold
Possibility 5 - Herb seedsEdit
  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Herb seed 5 Dwarf weed seed 1 2 Common 30,599
Herb seed 5 Torstol seed 2 2 Common 38,222
Possibility 6 - OresEdit

The expected value of Possibility 6 is Coins 1000 46,722, which is a profit/loss of Coins 1000 -24,074 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Coal Coal 80 (noted) 1 Always 19,280
Adamantite ore Adamantite ore 10 (noted) 1 Always 12,820
Corrupted ore Corrupted ore 50 1 Always Not sold
Possibility 7 - Rune HalberdEdit

The expected value of Possibility 7 is Coins 1000 89,840, which is a profit/loss of Coins 1000 19,044 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Rune halberd Rune halberd 1 1 Always 75,218
Possibility 8 - Rune armourEdit

The expected value of Possibility 8 is Coins 1000 66,635, which is a profit/loss of Coins 1000 -4,161 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Rune full helm Rune full helm 1 1 Always 20,256
Rune kiteshield Rune kiteshield 1 1 Always 31,757
Possibility 9 - Rune platelegs or plateskirtEdit

The expected value of Possibility 9 is Coins 1000 51,816 for male characters and Coins 1000 52,067 for female characters, which is a profit/loss of Coins 1000 -18,980 for male characters and Coins 1000 -18,729 for female characters, if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Rune platelegs Rune platelegs 1 2 Common [1] 37,194
Rune plateskirt Rune plateskirt 1 2 Common [1] 37,445
  1. ^ a b With Possibility 9, you are guaranteed to get either a rune platelegs or rune plateskirt. Male characters will always receive a rune platelegs, while female characters will always receive a rune plateskirt.
Possibility 10 - Rune barsEdit

The expected value of Possibility 10 is Coins 1000 56,943, which is a profit/loss of Coins 1000 -13,853 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Rune bar Rune bar 3 1 Always 42,321
Possibility 11 - TalismansEdit

The expected value of Possibility 11 is Coins 1000 48,433, which is a profit/loss of Coins 1000 -22,363 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Fire talisman Fire talisman 5 (noted) 1 Always 12,705
Water talisman Water talisman 2 (noted) 1 Always 21,106
Possibility 12 - Uncut gemsEdit

The expected value of Possibility 12 is Coins 1000 40,002, which is a profit/loss of Coins 1000 -30,794 if buying the crystal key on the GE.

  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Uncut diamond Uncut diamond 3 1 Always 16,650
Uncut ruby Uncut ruby 3 1 Always 8,730
Possibility 13 - Dragonstone armourEdit

The expected value of Possibility 13 is Coins 1000 24,002,886, which is a profit/loss of Coins 1000 23,932,090 if buying the crystal key on the GE.

Receiving this possibility is very rare.
  Item Quantity Rarity GE market price
Uncut dragonstone Uncut dragonstone 1 1 Always 14,622
Dragonstone helm Dragonstone helm 1 2 Common [1] 17,581,693
Dragonstone hauberk Dragonstone hauberk 1 2 Common [1] 42,376,486
Dragonstone greaves Dragonstone greaves 1 2 Common [1] 26,343,729
Dragonstone gauntlets Dragonstone gauntlets 1 2 Common [1] 16,283,740
Dragonstone boots Dragonstone boots 1 2 Common [1] 17,355,673
  1. ^ a b c d e With Possibility 13, you are guaranteed to get exactly one piece of dragonstone armour. Each piece has the same probability of being received.

Probabilities - Taverley chestEdit

The probabilities in this section are an estimation based on the data of 1134 crystal chest loots on the Taverley chest, while wearing a ring of wealth.
Possibility Percentage
Possibility 1: Fruit tree seed 8.02%[1]
Possibility 2: Lantadyme seeds 9.61%
Possibility 3: Grimy torstols 9.96%
Possibility 4: Runes 7.5%
Possibility 5: Iron ore 8.47%
Possibility 6: Coal 9.17%
Possibility 7: Rune bars 9.61%
Possibility 8: Gems 9.61%
Possibility 9: Loop half of a key 7.94%
Possibility 10: Tooth half of a key 6.61%
Possibility 11: Rune platebody 5.03%
Possibility 12: Rune platelegs or plateskirt 8.47%
Possibility 13: Dragonstone armour < 0.01%
  1. ^ The runescape wiki lists the probability of receiving a calquat or papaya tree seed at 5:11 (45.45%) each and the probability of receiving a palm tree seed at 1:11 (9%). This data shows a probability of 49.45% for the calquat, 47.25% for the papaya, and 3.30% for the palm tree seed.

Using these probabilities, the expected average profit/loss, per crystal key, when looting the crystal chest is Coins 1000 -12,065. (Assuming you will receive whichever of the rune platelegs and rune plateskirt is worth more, and the crystal key is bought at GE price). This is excluding the possibility of receiving a dragonstone armour piece, as this possibility is much too rare to estimate with any acceptable accuracy.

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