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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 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 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 46,647, which is a profit/loss of -6,311 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Calquat tree seed 5Calquat tree seed1Common[1]20,150
Papaya tree seed 5Papaya tree seed1Common[1]32,413
Palm tree seed 5Palm tree seed1Common[1]93,487
  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 20,628, which is a profit/loss of -32,330 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Lantadyme seed 5Lantadyme seed2Always6,372
Possibility 3 - Grimy torstolsEdit

The expected value of Possibility 3 is 24,914, which is a profit/loss of -28,044 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Grimy torstolGrimy torstol2Always10,658
Possibility 4 - RunesEdit

The expected value of Possibility 4 is 130,856, which is a profit/loss of 77,898 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Law runeLaw rune50Always13,600
Chaos runeChaos rune50Always4,800
Cosmic runeCosmic rune50Always12,700
Death runeDeath rune50Always12,200
Nature runeNature rune50Always14,900
Body runeBody rune200Always7,600
Mind runeMind rune200Always3,000
Earth runeEarth rune200Always3,600
Air runeAir rune200Always8,800
Water runeWater rune200Always3,800
Fire runeFire rune200Always31,600
Possibility 5 - Iron oreEdit

The expected value of Possibility 5 is 105,456, which is a profit/loss of 52,498 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Iron oreIron ore200 (noted)Always91,200
Possibility 6 - CoalEdit

The expected value of Possibility 6 is 76,506, which is a profit/loss of 23,548 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
CoalCoal150 (noted)Always62,250
Possibility 7 - Rune barsEdit

The expected value of Possibility 7 is 55,674, which is a profit/loss of 2,716 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Rune barRune bar3Always41,418
Possibility 8 - GemsEdit

The expected value of Possibility 8 is 43,062, which is a profit/loss of -9,896 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Uncut diamondUncut diamond3Always18,630
Uncut rubyUncut ruby3Always10,176
Possibility 9 - Loop half of a keyEdit

The expected value of Possibility 9 is 47,608, which is a profit/loss of -5,350 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Loop half of a keyLoop half of a key1Always18,352
Coins 10000Coins15,000Always15,000
Possibility 10 - Tooth half of a keyEdit

The expected value of Possibility 10 is 60,006, which is a profit/loss of 7,048 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Tooth half of a keyTooth half of a key1Always30,750
Coins 10000Coins15,000Always15,000
Possibility 11 - Rune platebodyEdit

The expected value of Possibility 11 is 52,082, which is a profit/loss of -876 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Rune platebodyRune platebody1Always37,826
Possibility 12 - Rune platelegs or plateskirtEdit

The expected value of Possibility 12 is 51,345 for male characters and 51,551 for female characters, which is a profit/loss of -1,613 for male characters and -1,407 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Rune platelegsRune platelegs1Common[1]37,089
Rune plateskirtRune plateskirt1Common[1]37,295
  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 8,487,965, which is a profit/loss of 8,435,007 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 dragonstone1Always14,256
Dragonstone helmDragonstone helm1Common[2]5,686,904
Dragonstone hauberkDragonstone hauberk1Common[2]13,352,619
Dragonstone greavesDragonstone greaves1Common[2]9,039,701
Dragonstone gauntletsDragonstone gauntlets1Common[2]6,595,090
Dragonstone bootsDragonstone boots1Common[2]7,694,231
  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 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 1Edit

The expected value of Possibility 1 is 43,396, which is a profit/loss of -9,562 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Grimy lantadymeGrimy lantadyme5Always29,140
Crystal tree blossomCrystal tree blossom1AlwaysNot sold
Possibility 2 - Tree seedsEdit

The expected value of Possibility 2 is 227,756, which is a profit/loss of 174,798 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Yew seed 5Yew seed1Common33,408
Papaya tree seed 5Papaya tree seed1Common32,413
Elder seed 5Elder seed1Uncommon147,679
Possibility 3 - Tooth half of a keyEdit

The expected value of Possibility 3 is 45,006, which is a profit/loss of -7,952 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Tooth half of a keyTooth half of a key1Always30,750
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 4 - Loop half of a keyEdit

The expected value of Possibility 4 is 32,608, which is a profit/loss of -20,350 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Loop half of a keyLoop half of a key1Always18,352
Crystal motherlode shardCrystal motherlode shard10CommonNot sold
Possibility 5 - Herb seedsEdit
Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Dwarf weed seed 5Dwarf weed seed1Common3,175
Torstol seed 5Torstol seed2Common5,098
Possibility 6 - OresEdit

The expected value of Possibility 6 is 58,916, which is a profit/loss of 5,958 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
CoalCoal80 (noted)Always33,200
Adamantite oreAdamantite ore10 (noted)Always11,460
Corrupted oreCorrupted ore50AlwaysNot sold
Possibility 7 - Rune HalberdEdit

The expected value of Possibility 7 is 89,972, which is a profit/loss of 37,014 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Rune halberdRune halberd1Always75,716
Possibility 8 - Rune armourEdit

The expected value of Possibility 8 is 65,933, which is a profit/loss of 12,975 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Rune full helmRune full helm1Always19,861
Rune kiteshieldRune kiteshield1Always31,816
Possibility 9 - Rune platelegs or plateskirtEdit

The expected value of Possibility 9 is 51,345 for male characters and 51,551 for female characters, which is a profit/loss of -1,613 for male characters and -1,407 for female characters, if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Rune platelegsRune platelegs1Common[1]37,089
Rune plateskirtRune plateskirt1Common[1]37,295
  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 55,674, which is a profit/loss of 2,716 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Rune barRune bar3Always41,418
Possibility 11 - TalismansEdit

The expected value of Possibility 11 is 46,682, which is a profit/loss of -6,276 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Fire talismanFire talisman5 (noted)Always11,860
Water talismanWater talisman2 (noted)Always20,566
Possibility 12 - Uncut gemsEdit

The expected value of Possibility 12 is 43,062, which is a profit/loss of -9,896 if buying the crystal key on the GE.

Item Quantity Rarity GE price
Uncut dragonstoneUncut dragonstone1Always14,256
Uncut diamondUncut diamond3Always18,630
Uncut rubyUncut ruby3Always10,176
Possibility 13 - Dragonstone armourEdit

The expected value of Possibility 13 is 8,487,965, which is a profit/loss of 8,435,007 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 dragonstone1Always14,256
Dragonstone helmDragonstone helm1Common[2]5,686,904
Dragonstone hauberkDragonstone hauberk1Common[2]13,352,619
Dragonstone greavesDragonstone greaves1Common[2]9,039,701
Dragonstone gauntletsDragonstone gauntlets1Common[2]6,595,090
Dragonstone bootsDragonstone boots1Common[2]7,694,231
  1. ^ Cite error: Invalid <ref> tag; no text was provided for refs named twitter.com
  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 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 5,230. (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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