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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 possibilities

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. Unless otherwise specified, all possibilities give all of the listed rewards when obtained.

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 a female character.

Taverley chest

Possibility 1 - Fruit tree seed

The expected value of Possibility 1 is 22,429, which is a profit/loss of -11,552 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Calquat tree seed 5Calquat tree seed1Common[1]108
Papaya tree seed 5Papaya tree seed1Common[1]11,193
Palm tree seed 5Palm tree seed1Uncommon[1]67,018
  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 seeds

The expected value of Possibility 2 is 11,594, which is a profit/loss of -22,387 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Lantadyme seed 5Lantadyme seed2Common394
Possibility 3 - Grimy torstols

The expected value of Possibility 3 is 17,366, which is a profit/loss of -16,615 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Grimy torstolGrimy torstol2Common6,166
Possibility 4 - Runes

The expected value of Possibility 4 is 121,800, which is a profit/loss of 87,819 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Law runeLaw rune50Common19,050
Chaos runeChaos rune50Common5,100
Cosmic runeCosmic rune50Common20,750
Death runeDeath rune50Common6,700
Nature runeNature rune50Common21,200
Body runeBody rune200Common7,000
Mind runeMind rune200Common3,800
Earth runeEarth rune200Common3,000
Air runeAir rune200Common6,400
Water runeWater rune200Common3,000
Fire runeFire rune200Common14,600
Possibility 5 - Iron ore

The expected value of Possibility 5 is 48,400, which is a profit/loss of 14,419 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Iron oreIron ore200 (noted)Common37,200
Possibility 6 - Coal

The expected value of Possibility 6 is 30,850, which is a profit/loss of -3,131 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
CoalCoal150 (noted)Common19,650
Possibility 7 - Rune bars

The expected value of Possibility 7 is 52,957, which is a profit/loss of 18,976 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Rune barRune bar3Common41,757
Possibility 8 - Gems

The expected value of Possibility 8 is 21,298, which is a profit/loss of -12,683 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Uncut diamondUncut diamond3Common6,879
Uncut rubyUncut ruby3Common3,219
Possibility 9 - Loop half of a key

The expected value of Possibility 9 is 42,627, which is a profit/loss of 8,646 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Loop half of a keyLoop half of a key1Common16,427
Coins 10000Coins15,000Common15,000
Possibility 10 - Tooth half of a key

The expected value of Possibility 10 is 44,738, which is a profit/loss of 10,757 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Tooth half of a keyTooth half of a key1Common18,538
Coins 10000Coins15,000Common15,000
Possibility 11 - Rune platebody

The expected value of Possibility 11 is 49,032, which is a profit/loss of 15,051 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Rune platebodyRune platebody1Common37,832
Possibility 12 - Rune platelegs or plateskirt

The expected value of Possibility 12 is 48,264 for male characters and 48,470 for female characters, which is a profit/loss of 14,283 for male characters and 14,489 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Rune platelegsRune platelegs1Common[1]37,064
Rune plateskirtRune plateskirt1Common[1]37,270
  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 armour

The expected value of Possibility 13 is 6,372,295, which is a profit/loss of 6,338,314 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 dragonstone1Always11,200
Dragonstone helmDragonstone helm1Very rare[2]4,966,259
Dragonstone hauberkDragonstone hauberk1Very rare[2]12,258,976
Dragonstone greavesDragonstone greaves1Very rare[2]5,732,394
Dragonstone gauntletsDragonstone gauntlets1Very rare[2]4,323,368
Dragonstone bootsDragonstone boots1Very rare[2]4,524,476
  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 chest

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. At the least, the player should still wear a Ring of wealth when opening either crystal chest.

Possibility 1 - Tree seeds

The expected value of Possibility 1 is 37,866.4, which is a profit/loss of 3,885.4 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Yew seed 5Yew seed1Common20,253
Papaya tree seed 5Papaya tree seed1Common11,193
Elder seed 5Elder seed1Uncommon70,440
Possibility 2 - Herb seeds

The expected value of Possibility 2 is 12,966, which is a profit/loss of -21,015 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Dwarf weed seed 5Dwarf weed seed1Common372
Torstol seed 5Torstol seed2Common1,394
Possibility 3

The expected value of Possibility 3 is 27,410, which is a profit/loss of -6,571 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Grimy lantadymeGrimy lantadyme5Common16,210
Crystal tree blossomCrystal tree blossom1CommonNot sold
Possibility 4 - Talismans

The expected value of Possibility 4 is 37,241, which is a profit/loss of 3,260 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Fire talismanFire talisman(noted)Common10,295
Water talismanWater talisman(noted)Common15,746
Possibility 5 - Rune Halberd

The expected value of Possibility 5 is 86,752, which is a profit/loss of 52,771 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Rune halberdRune halberd1Common75,552
Possibility 6 - Ores

The expected value of Possibility 6 is 36,760, which is a profit/loss of 2,779 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
CoalCoal80 (noted)Common10,480
Adamantite oreAdamantite ore10 (noted)Common15,080
Corrupted oreCorrupted ore50CommonNot sold
Possibility 7 - Rune bars

The expected value of Possibility 7 is 52,957, which is a profit/loss of 18,976 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Rune barRune bar3Common41,757
Possibility 8 - Uncut gems

The expected value of Possibility 8 is 21,298, which is a profit/loss of -12,683 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Uncut diamondUncut diamond3Common6,879
Uncut rubyUncut ruby3Common3,219
Possibility 9 - Loop half of a key

The expected value of Possibility 9 is 27,627, which is a profit/loss of -6,354 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Loop half of a keyLoop half of a key1Common16,427
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 10 - Tooth half of a key

The expected value of Possibility 10 is 29,738, which is a profit/loss of -4,243 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Tooth half of a keyTooth half of a key1Common18,538
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 11 - Rune armour

The expected value of Possibility 11 is 62,463, which is a profit/loss of 28,482 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Rune full helmRune full helm1Common19,869
Rune kiteshieldRune kiteshield1Common31,394
Possibility 12 - Rune platelegs or plateskirt

The expected value of Possibility 12 is 48,264 for male characters and 48,470 for female characters, which is a profit/loss of 14,283 for male characters and 14,489 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always11,200
Rune platelegsRune platelegs1Common[1]37,064
Rune plateskirtRune plateskirt1Common[1]37,270
  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 armour

The expected value of Possibility 13 is 6,372,295, which is a profit/loss of 6,338,314 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 dragonstone1Always11,200
Dragonstone helmDragonstone helm1Very rare[2]4,966,259
Dragonstone hauberkDragonstone hauberk1Very rare[2]12,258,976
Dragonstone greavesDragonstone greaves1Very rare[2]5,732,394
Dragonstone gauntletsDragonstone gauntlets1Very rare[2]4,323,368
Dragonstone bootsDragonstone boots1Very rare[2]4,524,476
  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 chest

The probabilities in this section are an estimation based on the data of 1000 crystal chest loots on the Taverley chest, while wearing a luck of the dwarves.
Possibility Percentage
Possibility 1: Fruit tree seed 6.4%[notes 1]
Possibility 2: Lantadyme seeds 7.9%
Possibility 3: Grimy torstols 9.4%
Possibility 4: Runes 10%
Possibility 5: Iron ore 9.1%
Possibility 6: Coal 9.8%
Possibility 7: Rune bars 9.4%
Possibility 8: Gems 8.3%
Possibility 9: Loop half of a key 7.4%
Possibility 10: Tooth half of a key 6.8%
Possibility 11: Rune platebody 7.2%
Possibility 12: Rune platelegs or plateskirt 8.3%
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 48.45% for the calquat, 42.18% for the papaya, and 9.37% for the palm tree seed.

Using these probabilities, the expected average profit/loss, per crystal key, when looting the crystal chest is 10,106. 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.

Prifddinas chest

The probabilities in this section are an estimation based on the data of 20,000 loots of the Prifddinas crystal chest while wearing luck of the dwarves. The loot from the Prifddinas chest is not affected by the Voice of Seren.[1]
Possibility Percentage
Possibility 1: Tree seeds 7.59%
Possibility 2: Herb seeds 7.555%
Possibility 3: Grimy lantadymes 4.47%
Possibility 4: Talismans 7.545%
Possibility 5: Rune Halberd 6.00%
Possibility 6: Ores 10.36%
Possibility 7: Rune bars 9.455%
Possibility 8: Gems 9.525%
Possibility 9: Loop half of a key 9.30%
Possibility 10: Tooth half of a key 9.045%
Possibility 11: Rune full helm and rune kiteshield 8.81%
Possibility 12: Rune platelegs or plateskirt 10.34%
Possibility 13: Dragonstone armour < 0.01%

Using these probabilities, the expected average profit/loss, per crystal key, when looting the crystal chest is 5,731. Assuming you will receive rune platelegs, the crystal key is bought at GE price and the luck of the dwarves ring is worn. This is excluding the possibility of receiving a dragonstone armour piece, as this possibility is much too rare to estimate with any acceptable accuracy.

Estimate probabilities for non-guaranteed loot are:

  • 17.785% chance of crystal motherlode shard when rolling possibility 9 or 10. This assumes that possibility 9 and 10 yield the same chance for crystal motherlode shards.
  • 8.675% chance of receiving elder seed when rolling possibility 1.
  • 63.385% chance of receiving papaya tree seed when rolling possibility 1.
  • 27.94% chance of receiving yew seed when rolling possibility 1.
  • 20.39% chance of receiving dwarf weed seed when rolling possibility 2.
  • 79.61% chance of receiving torstol seed when rolling possibility 2.

Trivia

  • The crystal key chest was reworked on 11 June 2013 with the release of the Triskelion Treasures. Previous old drops, such as receiving 2,000 coins and a Spinach roll along with an Uncut dragonstone, were removed, and new ones were added, such as the Dragonstone armour.
  • The estimated dragonstone armour possibility chance is about 0.000147%.

References

  1. ^ Mod Hunter. 10K crystal chests VoS vs. no VoS. 2017-06-29. "If nothing else all of your testing has at least gained mod confirmation that there isn't - and has never been - any impact from the VoS on the crystal chest."*