Crystal chest
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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 56,618, which is a profit/loss of 14,752 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Calquat tree seed  1  Common^{[1]}  13,476  
Papaya tree seed  1  Common^{[1]}  47,729  
Palm tree seed  1  Common^{[1]}  179,318 
 ^ ^{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 13,958, which is a profit/loss of 27,908 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Lantadyme seed  2  Always  1,462 
Possibility 3  Grimy torstolsEdit
The expected value of Possibility 3 is 21,106, which is a profit/loss of 20,760 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Grimy torstol  2  Always  8,610 
Possibility 4  RunesEdit
The expected value of Possibility 4 is 107,596, which is a profit/loss of 65,730 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Law rune  50  Always  10,950  
Chaos rune  50  Always  3,800  
Cosmic rune  50  Always  16,000  
Death rune  50  Always  10,200  
Nature rune  50  Always  17,550  
Body rune  200  Always  8,200  
Mind rune  200  Always  4,000  
Earth rune  200  Always  2,600  
Air rune  200  Always  4,800  
Water rune  200  Always  2,800  
Fire rune  200  Always  14,200 
Possibility 5  Iron oreEdit
The expected value of Possibility 5 is 81,896, which is a profit/loss of 40,030 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Iron ore  200 (noted)  Always  69,400 
Possibility 6  CoalEdit
The expected value of Possibility 6 is 46,096, which is a profit/loss of 4,230 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Coal  150 (noted)  Always  33,600 
Possibility 7  Rune barsEdit
The expected value of Possibility 7 is 54,820, which is a profit/loss of 12,954 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Rune bar  3  Always  42,324 
Possibility 8  GemsEdit
The expected value of Possibility 8 is 32,620, which is a profit/loss of 9,246 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Uncut diamond  3  Always  11,901  
Uncut ruby  3  Always  8,223 
Possibility 9  Loop half of a keyEdit
The expected value of Possibility 9 is 44,872, which is a profit/loss of 3,006 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Loop half of a key  1  Always  17,376  
Coins  15,000  Always  15,000 
Possibility 10  Tooth half of a keyEdit
The expected value of Possibility 10 is 51,683, which is a profit/loss of 9,817 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Tooth half of a key  1  Always  24,187  
Coins  15,000  Always  15,000 
Possibility 11  Rune platebodyEdit
The expected value of Possibility 11 is 50,230, which is a profit/loss of 8,364 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Rune platebody  1  Always  37,734 
Possibility 12  Rune platelegs or plateskirtEdit
The expected value of Possibility 12 is 49,567 for male characters and 49,526 for female characters, which is a profit/loss of 7,701 for male characters and 7,660 for female characters, if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Rune platelegs  1  Common^{[1]}  37,071  
Rune plateskirt  1  Common^{[1]}  37,030 
 ^ ^{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 4,908,082, which is a profit/loss of 4,866,216 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  12,496  
Dragonstone helm  1  Common^{[2]}  3,999,331  
Dragonstone hauberk  1  Common^{[2]}  8,596,798  
Dragonstone greaves  1  Common^{[2]}  4,249,487  
Dragonstone gauntlets  1  Common^{[2]}  3,780,508  
Dragonstone boots  1  Common^{[2]}  3,851,807 
 ^ 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 1Edit
The expected value of Possibility 1 is 30,161, which is a profit/loss of 11,705 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Grimy lantadyme  5  Always  17,665  
Crystal tree blossom  1  Always  Not sold 
Possibility 2  Tree seedsEdit
The expected value of Possibility 2 is 265,099, which is a profit/loss of 223,233 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Yew seed  1  Common  44,777  
Papaya tree seed  1  Common  47,729  
Elder seed  1  Uncommon  160,097 
Possibility 3  Tooth half of a keyEdit
The expected value of Possibility 3 is 36,683, which is a profit/loss of 5,183 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Tooth half of a key  1  Always  24,187  
Crystal motherlode shard  10  Common  Not sold 
Possibility 4  Loop half of a keyEdit
The expected value of Possibility 4 is 29,872, which is a profit/loss of 11,994 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Loop half of a key  1  Always  17,376  
Crystal motherlode shard  10  Common  Not sold 
Possibility 5  Herb seedsEdit
The expected value of Possibility 5 is 16,705, which is a profit/loss of 25,161 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Dwarf weed seed  1  Common  635  
Torstol seed  2  Common  3,574 
Possibility 6  OresEdit
The expected value of Possibility 6 is 46,016, which is a profit/loss of 4,150 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Coal  80 (noted)  Always  17,920  
Adamantite ore  10 (noted)  Always  15,600  
Corrupted ore  50  Always  Not sold 
Possibility 7  Rune HalberdEdit
The expected value of Possibility 7 is 87,680, which is a profit/loss of 45,814 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Rune halberd  1  Always  75,184 
Possibility 8  Rune armourEdit
The expected value of Possibility 8 is 63,285, which is a profit/loss of 21,419 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Rune full helm  1  Always  19,824  
Rune kiteshield  1  Always  30,965 
Possibility 9  Rune platelegs or plateskirtEdit
The expected value of Possibility 9 is 49,567 for male characters and 49,526 for female characters, which is a profit/loss of 7,701 for male characters and 7,660 for female characters, if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Rune platelegs  1  Common^{[1]}  37,071  
Rune plateskirt  1  Common^{[1]}  37,030 
 ^ ^{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 54,820, which is a profit/loss of 12,954 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Rune bar  3  Always  42,324 
Possibility 11  TalismansEdit
The expected value of Possibility 11 is 32,776, which is a profit/loss of 9,090 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Fire talisman  5 (noted)  Always  7,830  
Water talisman  2 (noted)  Always  12,450 
Possibility 12  Uncut gemsEdit
The expected value of Possibility 12 is 32,620, which is a profit/loss of 9,246 if buying the crystal key on the GE.
Item  Quantity  Rarity  GE price  

Uncut dragonstone  1  Always  12,496  
Uncut diamond  3  Always  11,901  
Uncut ruby  3  Always  8,223 
Possibility 13  Dragonstone armourEdit
The expected value of Possibility 13 is 4,908,082, which is a profit/loss of 4,866,216 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  12,496  
Dragonstone helm  1  Common^{[2]}  3,999,331  
Dragonstone hauberk  1  Common^{[2]}  8,596,798  
Dragonstone greaves  1  Common^{[2]}  4,249,487  
Dragonstone gauntlets  1  Common^{[2]}  3,780,508  
Dragonstone boots  1  Common^{[2]}  3,851,807 
 ^ 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 7,459. 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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