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TaverleyPrifddinas
Crystal chest
Crystal chest
Release date 27 February 2002 (Update)
Members Yes
Quest No
Location Taverley
Examine A crystal key can open it.
Crystal chest location
[view][talk]
Crystal chest
Crystal chest (Prifddinas)
Release date 22 September 2014 (Update)
Members Yes
Quest Plague's End
Location Prifddinas
Examine A crystal key can open it.
Crystal chest (Prifddinas) location
[view][talk]

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 district. 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 generally more profitable to sell the key than to use it. The key is used once and disappears upon usage.

Rewards possibilitiesEdit

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.

Taverley chestEdit

Possibility 1 - Fruit tree seedEdit

The expected value of Possibility 1 is 57,805, which is a profit/loss of 15,281 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Calquat tree seed 5Calquat tree seed1Common[1]9,013
Papaya tree seed 5Papaya tree seed1Common[1]50,268
Palm tree seed 5Palm tree seed1Common[1]202,579
  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 16,589, which is a profit/loss of -25,935 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Lantadyme seed 5Lantadyme seed2Always4,146
Possibility 3 - Grimy torstolsEdit

The expected value of Possibility 3 is 22,439, which is a profit/loss of -20,085 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Grimy torstolGrimy torstol2Always9,996
Possibility 4 - RunesEdit

The expected value of Possibility 4 is 119,343, which is a profit/loss of 76,819 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Law runeLaw rune50Always13,550
Chaos runeChaos rune50Always4,500
Cosmic runeCosmic rune50Always17,350
Death runeDeath rune50Always8,150
Nature runeNature rune50Always20,750
Body runeBody rune200Always7,000
Mind runeMind rune200Always4,200
Earth runeEarth rune200Always3,000
Air runeAir rune200Always7,400
Water runeWater rune200Always2,800
Fire runeFire rune200Always18,200
Possibility 5 - Iron oreEdit

The expected value of Possibility 5 is 72,243, which is a profit/loss of 29,719 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Iron oreIron ore200 (noted)Always59,800
Possibility 6 - CoalEdit

The expected value of Possibility 6 is 39,293, which is a profit/loss of -3,231 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
CoalCoal150 (noted)Always26,850
Possibility 7 - Rune barsEdit

The expected value of Possibility 7 is 54,284, which is a profit/loss of 11,760 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Rune barRune bar3Always41,841
Possibility 8 - GemsEdit

The expected value of Possibility 8 is 35,315, which is a profit/loss of -7,209 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Uncut diamondUncut diamond3Always13,791
Uncut rubyUncut ruby3Always9,081
Possibility 9 - Loop half of a keyEdit

The expected value of Possibility 9 is 47,899, which is a profit/loss of 5,375 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Loop half of a keyLoop half of a key1Always20,456
Coins 10000Coins15,000Always15,000
Possibility 10 - Tooth half of a keyEdit

The expected value of Possibility 10 is 50,882, which is a profit/loss of 8,358 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Tooth half of a keyTooth half of a key1Always23,439
Coins 10000Coins15,000Always15,000
Possibility 11 - Rune platebodyEdit

The expected value of Possibility 11 is 49,496, which is a profit/loss of 6,972 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Rune platebodyRune platebody1Always37,053
Possibility 12 - Rune platelegs or plateskirtEdit

The expected value of Possibility 12 is 49,143 for male characters and 49,105 for female characters, which is a profit/loss of 6,619 for male characters and 6,581 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Rune platelegsRune platelegs1Common[1]36,700
Rune plateskirtRune plateskirt1Common[1]36,662
  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 5,140,074, which is a profit/loss of 5,097,550 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 price
Uncut dragonstoneUncut dragonstone1Always12,443
Dragonstone helmDragonstone helm1Very rare[2]4,119,555
Dragonstone hauberkDragonstone hauberk1Very rare[2]9,372,954
Dragonstone greavesDragonstone greaves1Very rare[2]4,510,992
Dragonstone gauntletsDragonstone gauntlets1Very rare[2]3,728,332
Dragonstone bootsDragonstone boots1Very rare[2]3,906,320
  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.

Prifddinas chestEdit

This chest was released with the first part 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 1 - Tree seedsEdit

The expected value of Possibility 1 is 82,177.8, which is a profit/loss of 39,653.8 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Yew seed 5Yew seed1Common43,824
Papaya tree seed 5Papaya tree seed1Common50,268
Elder seed 5Elder seed1Uncommon160,490
Possibility 2 - Herb seedsEdit

The expected value of Possibility 2 is 22,128, which is a profit/loss of -20,396 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Dwarf weed seed 5Dwarf weed seed1Common1,883
Torstol seed 5Torstol seed2Common7,802
Possibility 3Edit

The expected value of Possibility 3 is 33,828, which is a profit/loss of -8,696 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Grimy lantadymeGrimy lantadyme5Always21,385
Crystal tree blossomCrystal tree blossom1AlwaysNot sold
Possibility 4 - TalismansEdit

The expected value of Possibility 4 is 34,007, which is a profit/loss of -8,517 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Fire talismanFire talisman(noted)Always8,690
Water talismanWater talisman(noted)Always12,874
Possibility 5 - Rune HalberdEdit

The expected value of Possibility 5 is 87,145, which is a profit/loss of 44,621 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Rune halberdRune halberd1Always74,702
Possibility 6 - OresEdit

The expected value of Possibility 6 is 39,793, which is a profit/loss of -2,731 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
CoalCoal80 (noted)Always14,320
Adamantite oreAdamantite ore10 (noted)Always13,030
Corrupted oreCorrupted ore50AlwaysNot sold
Possibility 7 - Rune barsEdit

The expected value of Possibility 7 is 54,284, which is a profit/loss of 11,760 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Rune barRune bar3Always41,841
Possibility 8 - Uncut gemsEdit

The expected value of Possibility 8 is 35,315, which is a profit/loss of -7,209 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Uncut diamondUncut diamond3Always13,791
Uncut rubyUncut ruby3Always9,081
Possibility 9 - Loop half of a keyEdit

The expected value of Possibility 9 is 32,899, which is a profit/loss of -9,625 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Loop half of a keyLoop half of a key1Always20,456
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 10 - Tooth half of a keyEdit

The expected value of Possibility 10 is 35,882, which is a profit/loss of -6,642 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Tooth half of a keyTooth half of a key1Always23,439
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 11 - Rune armourEdit

The expected value of Possibility 11 is 62,246, which is a profit/loss of 19,722 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Rune full helmRune full helm1Always19,250
Rune kiteshieldRune kiteshield1Always30,553
Possibility 12 - Rune platelegs or plateskirtEdit

The expected value of Possibility 12 is 49,143 for male characters and 49,105 for female characters, which is a profit/loss of 6,619 for male characters and 6,581 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always12,443
Rune platelegsRune platelegs1Common[1]36,700
Rune plateskirtRune plateskirt1Common[1]36,662
  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 5,140,074, which is a profit/loss of 5,097,550 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 price
Uncut dragonstoneUncut dragonstone1Always12,443
Dragonstone helmDragonstone helm1Very rare[2]4,119,555
Dragonstone hauberkDragonstone hauberk1Very rare[2]9,372,954
Dragonstone greavesDragonstone greaves1Very rare[2]4,510,992
Dragonstone gauntletsDragonstone gauntlets1Very rare[2]3,728,332
Dragonstone bootsDragonstone boots1Very rare[2]3,906,320
  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.

ProbabilitiesEdit

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 official 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 7,043. 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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