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Crystal chest

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The crystal key chest is a treasure chest in Taverley that is famous for containing uncut dragonstones, among other things. The chest, located in Ivy Sophista's house, is locked and can only be opened by a crystal key. The crystal key is made up of a loop half of a key and the tooth half of a key; you can make the crystal key by using them with each other, or selecting the "Assemble" option. 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.

Attempting to open the chest without the crystal key yields the message: "This chest is securely locked shut."

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 a crystal shield or a crystal bow from the chest. The chest does not contain either of these items, as they are a quest reward.

PossibilitiesEdit

Possibility 1 - Fruit tree seedEdit

The expected value of Possibility 1 is Coins 1000 58,294, which is a profit/loss of Coins 1000 -9,927 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Calquat tree seed 5 Calquat tree seed 1 2 Common [1] 14,284
Papaya tree seed 5 Papaya tree seed 1 2 Common [1] 57,831
Palm tree seed 5 Palm tree seed 1 2 Common [1] 103,439
  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 Coins 1000 106,889, which is a profit/loss of Coins 1000 38,668 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Herb seed 5 Lantadyme seed 2 1 Always 90,778

Possibility 3 - Grimy torstolsEdit

The expected value of Possibility 3 is Coins 1000 31,521, which is a profit/loss of Coins 1000 -36,700 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Grimy torstol Grimy torstol 2 1 Always 15,410

Possibility 4 - RunesEdit

The expected value of Possibility 4 is Coins 1000 95,861, which is a profit/loss of Coins 1000 27,640 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Law rune Law rune 50 1 Always 14,350
Chaos rune Chaos rune 50 1 Always 2,050
Cosmic rune Cosmic rune 50 1 Always 13,150
Death rune Death rune 50 1 Always 9,150
Nature rune Nature rune 50 1 Always 15,250
Body rune Body rune 200 1 Always 1,400
Mind rune Mind rune 200 1 Always 1,000
Earth rune Earth rune 200 1 Always 2,800
Air rune Air rune 200 1 Always 4,800
Water rune Water rune 200 1 Always 5,400
Fire rune Fire rune 200 1 Always 10,400

Possibility 5 - Iron oreEdit

The expected value of Possibility 5 is Coins 1000 94,111, which is a profit/loss of Coins 1000 25,890 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Iron ore Iron ore 200 (noted) 1 Always 78,000

Possibility 6 - CoalEdit

The expected value of Possibility 6 is Coins 1000 49,861, which is a profit/loss of Coins 1000 -18,360 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Coal Coal 150 (noted) 1 Always 33,750

Possibility 7 - Rune barsEdit

The expected value of Possibility 7 is Coins 1000 59,755, which is a profit/loss of Coins 1000 -8,466 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Rune bar Rune bar 3 1 Always 43,644

Possibility 8 - GemsEdit

The expected value of Possibility 8 is Coins 1000 47,839, which is a profit/loss of Coins 1000 -20,382 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Uncut diamond Uncut diamond 3 1 Always 20,307
Uncut ruby Uncut ruby 3 1 Always 11,421

Possibility 9 - Loop half of a keyEdit

The expected value of Possibility 9 is Coins 1000 51,171, which is a profit/loss of Coins 1000 -17,050 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Loop half of a key Loop half of a key 1 1 Always 20,060
Coins 1000 Coins 15,000 1 Always Not sold

Possibility 10 - Tooth half of a keyEdit

The expected value of Possibility 10 is Coins 1000 75,742, which is a profit/loss of Coins 1000 7,521 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Tooth half of a key Tooth half of a key 1 1 Always 44,631
Coins 1000 Coins 15,000 1 Always Not sold

Possibility 11 - Rune platebodyEdit

The expected value of Possibility 11 is Coins 1000 54,054, which is a profit/loss of Coins 1000 -14,167 if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Rune platebody Rune platebody 1 1 Always 37,943

Possibility 12 - Rune platelegs or plateskirtEdit

The expected value of Possibility 12 is Coins 1000 53,329 for male characters and Coins 1000 53,446 for female characters, which is a profit/loss of Coins 1000 -14,892 for male characters and Coins 1000 -14,775 for female characters, if buying the crystal key on the GE.

  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Rune platelegs Rune platelegs 1 2 Common [1] 37,218
Rune plateskirt Rune plateskirt 1 2 Common [1] 37,335
  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 Coins 1000 26,308,398, which is a profit/loss of Coins 1000 26,240,177 if buying the crystal key on the GE.

Receiving this possibility is very rare.
  Item Quantity Rarity GE Market Price
Uncut dragonstone Uncut dragonstone 1 1 Always 16,111
Dragonstone helm Dragonstone helm 1 2 Common [1] 19,562,130
Dragonstone hauberk Dragonstone hauberk 1 2 Common [1] 49,280,608
Dragonstone greaves Dragonstone greaves 1 2 Common [1] 27,913,655
Dragonstone gauntlets Dragonstone gauntlets 1 2 Common [1] 16,685,388
Dragonstone boots Dragonstone boots 1 2 Common [1] 18,019,653
  1. ^ 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

The probabilities in this section are an estimation based on the data of 1134 crystal chest loots, 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 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 Coins 1000 -3,746. (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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