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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 63,233, which is a profit/loss of 5,111 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Calquat tree seed 5Calquat tree seed1Common[1]18,551
Papaya tree seed 5Papaya tree seed1Common[1]61,612
Palm tree seed 5Palm tree seed1Common[1]157,724
  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 31,129, which is a profit/loss of -26,993 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Herb seed 5Lantadyme seed2Always18,672
Possibility 3 - Grimy torstolsEdit

The expected value of Possibility 3 is 21,511, which is a profit/loss of -36,611 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Grimy torstolGrimy torstol2Always9,054
Possibility 4 - RunesEdit

The expected value of Possibility 4 is 104,157, which is a profit/loss of 46,035 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Law runeLaw rune50Always13,250
Chaos runeChaos rune50Always2,450
Cosmic runeCosmic rune50Always11,500
Death runeDeath rune50Always18,000
Nature runeNature rune50Always11,100
Body runeBody rune200Always13,200
Mind runeMind rune200Always4,400
Earth runeEarth rune200Always2,800
Air runeAir rune200Always3,000
Water runeWater rune200Always4,000
Fire runeFire rune200Always8,000
Possibility 5 - Iron oreEdit

The expected value of Possibility 5 is 54,057, which is a profit/loss of -4,065 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Iron oreIron ore200 (noted)Always41,600
Possibility 6 - CoalEdit

The expected value of Possibility 6 is 70,807, which is a profit/loss of 12,685 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
CoalCoal150 (noted)Always58,350
Possibility 7 - Rune barsEdit

The expected value of Possibility 7 is 55,291, which is a profit/loss of -2,831 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Rune barRune bar3Always42,834
Possibility 8 - GemsEdit

The expected value of Possibility 8 is 31,795, which is a profit/loss of -26,327 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Uncut diamondUncut diamond3Always11,865
Uncut rubyUncut ruby3Always7,473
Possibility 9 - Loop half of a keyEdit

The expected value of Possibility 9 is 45,440, which is a profit/loss of -12,682 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Loop half of a keyLoop half of a key1Always17,983
Coins 10000Coins15,000AlwaysNot sold
Possibility 10 - Tooth half of a keyEdit

The expected value of Possibility 10 is 64,465, which is a profit/loss of 6,343 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Tooth half of a keyTooth half of a key1Always37,008
Coins 10000Coins15,000AlwaysNot sold
Possibility 11 - Rune platebodyEdit

The expected value of Possibility 11 is 50,413, which is a profit/loss of -7,709 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Rune platebodyRune platebody1Always37,956
Possibility 12 - Rune platelegs or plateskirtEdit

The expected value of Possibility 12 is 49,768 for male characters and 49,906 for female characters, which is a profit/loss of -8,354 for male characters and -8,216 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Rune platelegsRune platelegs1Common[1]37,311
Rune plateskirtRune plateskirt1Common[1]37,449
  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 9,935,568, which is a profit/loss of 9,877,446 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 dragonstone1Always12,457
Dragonstone helmDragonstone helm1Common[2]6,835,023
Dragonstone hauberkDragonstone hauberk1Common[2]17,093,879
Dragonstone greavesDragonstone greaves1Common[2]11,025,100
Dragonstone gauntletsDragonstone gauntlets1Common[2]7,002,990
Dragonstone bootsDragonstone boots1Common[2]7,658,563
  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 42,077, which is a profit/loss of -16,045 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Grimy lantadymeGrimy lantadyme5Always29,620
Crystal tree blossomCrystal tree blossom1AlwaysNot sold
Possibility 2 - Tree seedsEdit
Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Yew seed 5Yew seed1Common54,356
Papaya tree seed 5Papaya tree seed1Common61,612
Elder seed 5Elder seed1Uncommon208,000
Possibility 3 - Tooth half of a keyEdit

The expected value of Possibility 3 is 49,465, which is a profit/loss of -8,657 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Tooth half of a keyTooth half of a key1Always37,008
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 4 - Loop half of a keyEdit

The expected value of Possibility 4 is 30,440, which is a profit/loss of -27,682 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Loop half of a keyLoop half of a key1Always17,983
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 5 - Herb seedsEdit
Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Herb seed 5Dwarf weed seed1Common12,345
Herb seed 5Torstol seed2Common10,618
Possibility 6 - OresEdit

The expected value of Possibility 6 is 56,247, which is a profit/loss of -1,875 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
CoalCoal80 (noted)Always31,120
Adamantite oreAdamantite ore10 (noted)Always12,670
Corrupted oreCorrupted ore50AlwaysNot sold
Possibility 7 - Rune HalberdEdit

The expected value of Possibility 7 is 86,747, which is a profit/loss of 28,625 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Rune halberdRune halberd1Always74,290
Possibility 8 - Rune armourEdit

The expected value of Possibility 8 is 64,208, which is a profit/loss of 6,086 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Rune full helmRune full helm1Always20,163
Rune kiteshieldRune kiteshield1Always31,588
Possibility 9 - Rune platelegs or plateskirtEdit

The expected value of Possibility 9 is 49,768 for male characters and 49,906 for female characters, which is a profit/loss of -8,354 for male characters and -8,216 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Rune platelegsRune platelegs1Common[1]37,311
Rune plateskirtRune plateskirt1Common[1]37,449
  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 55,291, which is a profit/loss of -2,831 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Rune barRune bar3Always42,834
Possibility 11 - TalismansEdit

The expected value of Possibility 11 is 50,314, which is a profit/loss of -7,808 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Fire talismanFire talisman5 (noted)Always14,025
Water talismanWater talisman2 (noted)Always23,832
Possibility 12 - Uncut gemsEdit

The expected value of Possibility 12 is 31,795, which is a profit/loss of -26,327 if buying the crystal key on the GE.

Item Quantity Rarity GE market price
Uncut dragonstoneUncut dragonstone1Always12,457
Uncut diamondUncut diamond3Always11,865
Uncut rubyUncut ruby3Always7,473
Possibility 13 - Dragonstone armourEdit

The expected value of Possibility 13 is 9,935,568, which is a profit/loss of 9,877,446 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 dragonstone1Always12,457
Dragonstone helmDragonstone helm1Common[2]6,835,023
Dragonstone hauberkDragonstone hauberk1Common[2]17,093,879
Dragonstone greavesDragonstone greaves1Common[2]11,025,100
Dragonstone gauntletsDragonstone gauntlets1Common[2]7,002,990
Dragonstone bootsDragonstone boots1Common[2]7,658,563
  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 -6,032. (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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