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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 Clan 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 crystal weapons from the chest. The chest does not contain any of these items, as they are a quest reward.

Possibilities - Taverley chestEdit

Possibility 1 - Fruit tree seedEdit

The expected value of Possibility 1 is 70,862, which is a profit/loss of 10,579 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Calquat tree seed 5Calquat tree seed1Common [1]23,866
Papaya tree seed 5Papaya tree seed1Common [1]68,794
Palm tree seed 5Palm tree seed1Common [1]175,733
  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 31,630, which is a profit/loss of -28,653 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Herb seed 5Lantadyme seed2Always18,862
Possibility 3 - Grimy torstolsEdit

The expected value of Possibility 3 is 23,506, which is a profit/loss of -36,777 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Grimy torstolGrimy torstol2Always10,738
Possibility 4 - RunesEdit

The expected value of Possibility 4 is 105,868, which is a profit/loss of 45,585 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Law runeLaw rune50Always12,200
Chaos runeChaos rune50Always2,200
Cosmic runeCosmic rune50Always13,850
Death runeDeath rune50Always17,400
Nature runeNature rune50Always7,850
Body runeBody rune200Always19,000
Mind runeMind rune200Always3,000
Earth runeEarth rune200Always2,400
Air runeAir rune200Always2,600
Water runeWater rune200Always3,000
Fire runeFire rune200Always9,600
Possibility 5 - Iron oreEdit

The expected value of Possibility 5 is 51,568, which is a profit/loss of -8,715 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Iron oreIron ore200 (noted)Always38,800
Possibility 6 - CoalEdit

The expected value of Possibility 6 is 59,868, which is a profit/loss of -415 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
CoalCoal150 (noted)Always47,100
Possibility 7 - Rune barsEdit

The expected value of Possibility 7 is 56,148, which is a profit/loss of -4,135 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Rune barRune bar3Always43,380
Possibility 8 - GemsEdit

The expected value of Possibility 8 is 30,501, which is a profit/loss of -29,782 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Uncut diamondUncut diamond3Always11,172
Uncut rubyUncut ruby3Always6,561
Possibility 9 - Loop half of a keyEdit

The expected value of Possibility 9 is 45,785, which is a profit/loss of -14,498 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Loop half of a keyLoop half of a key1Always18,017
Coins 10000Coins15,000AlwaysNot sold
Possibility 10 - Tooth half of a keyEdit

The expected value of Possibility 10 is 68,482, which is a profit/loss of 8,199 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Tooth half of a keyTooth half of a key1Always40,714
Coins 10000Coins15,000AlwaysNot sold
Possibility 11 - Rune platebodyEdit

The expected value of Possibility 11 is 50,778, which is a profit/loss of -9,505 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Rune platebodyRune platebody1Always38,010
Possibility 12 - Rune platelegs or plateskirtEdit

The expected value of Possibility 12 is 50,101 for male characters and 50,062 for female characters, which is a profit/loss of -10,182 for male characters and -10,221 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Rune platelegsRune platelegs1Common [1]37,333
Rune plateskirtRune plateskirt1Common [1]37,294
  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 10,535,977, which is a profit/loss of 10,475,694 if buying the crystal key on the GE.

Receiving this possibility is very rare, at a rate of 1/6801[1].
Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Dragonstone helmDragonstone helm1Common [2]7,046,438
Dragonstone hauberkDragonstone hauberk1Common [2]18,897,877
Dragonstone greavesDragonstone greaves1Common [2]12,173,692
Dragonstone gauntletsDragonstone gauntlets1Common [2]6,964,676
Dragonstone bootsDragonstone boots1Common [2]7,533,362
  1. ^ https://twitter.com/JagexTimbo/status/557600452150579200
  2. ^ 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

Prifddinas 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 42,358, which is a profit/loss of -17,925 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Grimy lantadymeGrimy lantadyme5Always29,590
Crystal tree blossomCrystal tree blossom1AlwaysNot sold
Possibility 2 - Tree seedsEdit
Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Yew seed 5Yew seed1Common63,943
Papaya tree seed 5Papaya tree seed1Common68,794
Elder seed 5Elder seed1Uncommon127,204
Possibility 3 - Tooth half of a keyEdit

The expected value of Possibility 3 is 53,482, which is a profit/loss of -6,801 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Tooth half of a keyTooth half of a key1Always40,714
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 4 - Loop half of a keyEdit

The expected value of Possibility 4 is 30,785, which is a profit/loss of -29,498 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Loop half of a keyLoop half of a key1Always18,017
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 5 - Herb seedsEdit
Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Herb seed 5Dwarf weed seed1Common15,601
Herb seed 5Torstol seed2Common17,010
Possibility 6 - OresEdit

The expected value of Possibility 6 is 52,338, which is a profit/loss of -7,945 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
CoalCoal80 (noted)Always25,120
Adamantite oreAdamantite ore10 (noted)Always14,450
Corrupted oreCorrupted ore50AlwaysNot sold
Possibility 7 - Rune HalberdEdit

The expected value of Possibility 7 is 88,507, which is a profit/loss of 28,224 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Rune halberdRune halberd1Always75,739
Possibility 8 - Rune armourEdit

The expected value of Possibility 8 is 64,623, which is a profit/loss of 4,340 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Rune full helmRune full helm1Always20,204
Rune kiteshieldRune kiteshield1Always31,651
Possibility 9 - Rune platelegs or plateskirtEdit

The expected value of Possibility 9 is 50,101 for male characters and 50,062 for female characters, which is a profit/loss of -10,182 for male characters and -10,221 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Rune platelegsRune platelegs1Common [1]37,333
Rune plateskirtRune plateskirt1Common [1]37,294
  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 56,148, which is a profit/loss of -4,135 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Rune barRune bar3Always43,380
Possibility 11 - TalismansEdit

The expected value of Possibility 11 is 52,047, which is a profit/loss of -8,236 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Fire talismanFire talisman5 (noted)Always14,715
Water talismanWater talisman2 (noted)Always24,564
Possibility 12 - Uncut gemsEdit

The expected value of Possibility 12 is 30,501, which is a profit/loss of -29,782 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Uncut diamondUncut diamond3Always11,172
Uncut rubyUncut ruby3Always6,561
Possibility 13 - Dragonstone armourEdit

The expected value of Possibility 13 is 10,535,977, which is a profit/loss of 10,475,694 if buying the crystal key on the GE.

Receiving this possibility is very rare, at a rate of 1/6801[1].
Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,768
Dragonstone helmDragonstone helm1Common [2]7,046,438
Dragonstone hauberkDragonstone hauberk1Common [2]18,897,877
Dragonstone greavesDragonstone greaves1Common [2]12,173,692
Dragonstone gauntletsDragonstone gauntlets1Common [2]6,964,676
Dragonstone bootsDragonstone boots1Common [2]7,533,362
  1. ^ https://twitter.com/JagexTimbo/status/557600452150579200
  2. ^ 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 -8,135. (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.

TriviaEdit

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