Crystal chest
this wiki
Release date  22 September 2014 (Update) 

Members  Yes 
Quest  Plague's End 
Location  Prifddinas 
Examine  A crystal key can open it. 
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 dragonstone  1  Always  12,443  
Calquat tree seed  1  Common^{[1]}  9,013  
Papaya tree seed  1  Common^{[1]}  50,268  
Palm tree seed  1  Common^{[1]}  202,579 
 ^ ^{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 dragonstone  1  Always  12,443  
Lantadyme seed  2  Always  4,146 
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 dragonstone  1  Always  12,443  
Grimy torstol  2  Always  9,996 
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 dragonstone  1  Always  12,443  
Law rune  50  Always  13,550  
Chaos rune  50  Always  4,500  
Cosmic rune  50  Always  17,350  
Death rune  50  Always  8,150  
Nature rune  50  Always  20,750  
Body rune  200  Always  7,000  
Mind rune  200  Always  4,200  
Earth rune  200  Always  3,000  
Air rune  200  Always  7,400  
Water rune  200  Always  2,800  
Fire rune  200  Always  18,200 
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 dragonstone  1  Always  12,443  
Iron ore  200 (noted)  Always  59,800 
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 dragonstone  1  Always  12,443  
Coal  150 (noted)  Always  26,850 
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 dragonstone  1  Always  12,443  
Rune bar  3  Always  41,841 
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 dragonstone  1  Always  12,443  
Uncut diamond  3  Always  13,791  
Uncut ruby  3  Always  9,081 
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 dragonstone  1  Always  12,443  
Loop half of a key  1  Always  20,456  
Coins  15,000  Always  15,000 
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 dragonstone  1  Always  12,443  
Tooth half of a key  1  Always  23,439  
Coins  15,000  Always  15,000 
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 dragonstone  1  Always  12,443  
Rune platebody  1  Always  37,053 
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 dragonstone  1  Always  12,443  
Rune platelegs  1  Common^{[1]}  36,700  
Rune plateskirt  1  Common^{[1]}  36,662 
 ^ ^{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 dragonstone  1  Always  12,443  
Dragonstone helm  1  Very rare^{[2]}  4,119,555  
Dragonstone hauberk  1  Very rare^{[2]}  9,372,954  
Dragonstone greaves  1  Very rare^{[2]}  4,510,992  
Dragonstone gauntlets  1  Very rare^{[2]}  3,728,332  
Dragonstone boots  1  Very rare^{[2]}  3,906,320 
 ^ https://twitter.com/JagexTimbo/status/557600452150579200
 ^ ^{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 Prifddinasrelated 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 dragonstone  1  Always  12,443  
Yew seed  1  Common  43,824  
Papaya tree seed  1  Common  50,268  
Elder seed  1  Uncommon  160,490 
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 dragonstone  1  Always  12,443  
Dwarf weed seed  1  Common  1,883  
Torstol seed  2  Common  7,802 
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 dragonstone  1  Always  12,443  
Grimy lantadyme  5  Always  21,385  
Crystal tree blossom  1  Always  Not 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 dragonstone  1  Always  12,443  
Fire talisman  5 (noted)  Always  8,690  
Water talisman  2 (noted)  Always  12,874 
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 dragonstone  1  Always  12,443  
Rune halberd  1  Always  74,702 
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 dragonstone  1  Always  12,443  
Coal  80 (noted)  Always  14,320  
Adamantite ore  10 (noted)  Always  13,030  
Corrupted ore  50  Always  Not 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 dragonstone  1  Always  12,443  
Rune bar  3  Always  41,841 
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 dragonstone  1  Always  12,443  
Uncut diamond  3  Always  13,791  
Uncut ruby  3  Always  9,081 
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 dragonstone  1  Always  12,443  
Loop half of a key  1  Always  20,456  
Crystal motherlode shard  10  Common  Not 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 dragonstone  1  Always  12,443  
Tooth half of a key  1  Always  23,439  
Crystal motherlode shard  10  Common  Not 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 dragonstone  1  Always  12,443  
Rune full helm  1  Always  19,250  
Rune kiteshield  1  Always  30,553 
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 dragonstone  1  Always  12,443  
Rune platelegs  1  Common^{[1]}  36,700  
Rune plateskirt  1  Common^{[1]}  36,662 
 ^ ^{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 dragonstone  1  Always  12,443  
Dragonstone helm  1  Very rare^{[2]}  4,119,555  
Dragonstone hauberk  1  Very rare^{[2]}  9,372,954  
Dragonstone greaves  1  Very rare^{[2]}  4,510,992  
Dragonstone gauntlets  1  Very rare^{[2]}  3,728,332  
Dragonstone boots  1  Very rare^{[2]}  3,906,320 
 ^ https://twitter.com/JagexTimbo/status/557600452150579200
 ^ ^{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% 
 ^ 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
 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.
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