Crystal chest

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TaverleyPrifddinas

Crystal chest
Release date	27 February 2002 (Update)
Members	Yes
Quest	No
Location	Taverley
Examine	A crystal key can open it.
Infobox • Talk page

Crystal chest
Release date	22 September 2014 (Update)
Members	Yes
Quest	Plague's End
Location	Prifddinas
Examine	A crystal key can open it.
Infobox • Talk page

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.

Wearing a ring of wealth or luck of the dwarves will increase your chances of getting a better drop.

Taverley chest

Possibility 1 - Fruit tree seed

The expected value of Possibility 1 is 15,525, which is a profit/loss of -8,073 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Calquat tree seed (m)		1	Common	34	204
	Papaya tree seed (m)		1	Common	3,056	69
	Palm tree seed (m)		1	Uncommon	22,142	152

Possibility 2 - Lantadyme seeds

The expected value of Possibility 2 is 12,790, which is a profit/loss of -10,808 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Lantadyme seed (m)		2	Common	672	76

Possibility 3 - Grimy torstols

The expected value of Possibility 3 is 20,544, which is a profit/loss of -3,054 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Grimy torstol (m)		2	Common	8,360	0

Possibility 4 - Runes

The expected value of Possibility 4 is 135,708, which is a profit/loss of 112,110 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Law rune		50	Common	20,100	3,750
	Chaos rune		50	Common	5,800	1,400
	Cosmic rune		50	Common	21,800	2,300
	Death rune		50	Common	5,900	3,100
	Nature rune		50	Common	20,850	3,700
	Body rune		200	Common	6,200	600
	Mind rune		200	Common	3,800	600
	Earth rune		200	Common	3,800	600
	Air rune		200	Common	8,600	600
	Water rune		200	Common	4,200	600
	Fire rune		200	Common	22,000	600

Possibility 5 - Iron stone spirits

The expected value of Possibility 5 is 24,508, which is a profit/loss of 910 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Iron stone spirit		200	Common	12,000	Not alchemisable

Possibility 6 - Coal stone spirits

The expected value of Possibility 6 is 16,008, which is a profit/loss of -7,590 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Coal stone spirit		150	Common	3,750	Not alchemisable

Possibility 7 - Runite stone spirits

The expected value of Possibility 7 is 13,638, which is a profit/loss of -9,960 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Runite stone spirit		3	Common	1,530	Not alchemisable

Possibility 8 - Gems

The expected value of Possibility 8 is 22,812, which is a profit/loss of -786 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Uncut diamond		3	Common	7,383	360
	Uncut ruby		3	Common	3,321	180

Possibility 9 - Loop half of a key

The expected value of Possibility 9 is 37,950, which is a profit/loss of 14,352 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Loop half of a key (m)		1	Common	10,625	0
	Coins		15,000	Common	15,000	15,000

Possibility 10 - Tooth half of a key

The expected value of Possibility 10 is 40,946, which is a profit/loss of 17,348 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Tooth half of a key (m)		1	Common	13,838	0
	Coins		15,000	Common	15,000	15,000

Possibility 11 - Huge plated rune salvage

The expected value of Possibility 11 is 51,031, which is a profit/loss of 27,433 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Huge plated rune salvage		1	Common	38,907	40,000

Possibility 12 - Large plated rune salvage

The expected value of Possibility 12 is 42,912, which is a profit/loss of 19,314 , if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Large plated rune salvage		1	Common	30,678	32,000

Possibility 13 - Dragonstone armour

The expected value of Possibility 13 is 5,928,846, which is a profit/loss of 5,905,248 if buying the crystal key on the GE.

Receiving this possibility is very rare, at a rate of 1/6801.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Dragonstone helm		1	Very rare	4,740,311	30,000
	Dragonstone hauberk		1	Very rare	11,624,418	84,000
	Dragonstone greaves		1	Very rare	5,484,760	51,000
	Dragonstone gauntlets		1	Very rare	3,836,860	18,000
	Dragonstone boots		1	Very rare	3,897,340	18,000

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 24,163.8, which is a profit/loss of 565.8 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Yew seed (m)		1	Common	6,560	85
	Papaya tree seed (m)		1	Common	3,056	69
	Elder seed (m)		1	Uncommon	41,047	600

Possibility 2 - Herb seeds

The expected value of Possibility 2 is 14,166, which is a profit/loss of -9,432 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Dwarf weed seed (m)		1	Common	302	38
	Torstol seed (m)		2	Common	1,758	76

Possibility 3

The expected value of Possibility 3 is 33,938, which is a profit/loss of 10,340 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Grimy lantadyme (m)		5	Common	21,560	0
	Crystal tree blossom (m)		1	Common	Not sold	Not alchemisable

Possibility 4 - Talismans

The expected value of Possibility 4 is 20,994, which is a profit/loss of -2,604 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Fire talisman		5 (noted)	Common	1,515	10
	Water talisman		2 (noted)	Common	7,376	4

Possibility 5 - Huge bladed rune salvage

The expected value of Possibility 5 is 91,028, which is a profit/loss of 67,430 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Huge bladed rune salvage		2 (noted)	Common	78,920	80,000

Possibility 6 - Stone spirits

The expected value of Possibility 6 is 14,688, which is a profit/loss of -8,910 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Coal stone spirit		80	Common	2,000	Not alchemisable
	Adamantite stone spirit		10	Common	490	Not alchemisable
	Corrupted ore (m)		50	Common	Not sold	Not alchemisable

Possibility 7 - Runite stone spirits

The expected value of Possibility 7 is 13,638, which is a profit/loss of -9,960 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Runite stone spirit		3	Common	1,530	Not alchemisable

Possibility 8 - Uncut gems

The expected value of Possibility 8 is 22,812, which is a profit/loss of -786 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Uncut diamond		3	Common	7,383	360
	Uncut ruby		3	Common	3,321	180

Possibility 9 - Loop half of a key

The expected value of Possibility 9 is 22,950, which is a profit/loss of -648 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Loop half of a key (m)		1	Common	10,625	0
	Crystal motherlode shard (m)		10	Common	Not sold	Not alchemisable

Possibility 10 - Tooth half of a key

The expected value of Possibility 10 is 25,946, which is a profit/loss of 2,348 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Tooth half of a key (m)		1	Common	13,838	0
	Crystal motherlode shard (m)		10	Common	Not sold	Not alchemisable

Possibility 11 - Large plated rune salvage and Medium plated rune salvage

The expected value of Possibility 11 is 66,043, which is a profit/loss of 42,445 if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Medium plated rune salvage		1	Common	23,029	24,000
	Large plated rune salvage		1	Common	30,678	32,000

Possibility 12 - Large plated rune salvage

The expected value of Possibility 12 is 42,912, which is a profit/loss of 19,314 , if buying the crystal key on the GE.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Large plated rune salvage		2	Common	61,356	64,000

Possibility 13 - Dragonstone armour

The expected value of Possibility 13 is 5,928,846, which is a profit/loss of 5,905,248 if buying the crystal key on the GE.

Receiving this possibility is very rare, at a rate of 1/6801.

	Item		Quantity	Rarity	GE price	High alch value
	Uncut dragonstone (m)		1	Always	12,108	600
	Dragonstone helm		1	Very rare	4,740,311	30,000
	Dragonstone hauberk		1	Very rare	11,624,418	84,000
	Dragonstone greaves		1	Very rare	5,484,760	51,000
	Dragonstone gauntlets		1	Very rare	3,836,860	18,000
	Dragonstone boots		1	Very rare	3,897,340	18,000

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%
Possibility 2: Lantadyme seeds	7.9%
Possibility 3: Grimy torstols	9.4%
Possibility 4: Runes	10%
Possibility 5: Iron stone spirits	9.1%
Possibility 6: Coal stone spirits	9.8%
Possibility 7: Runite stone spirits	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: Huge plated rune salvage	7.2%
Possibility 12: Large plated rune salvage	8.3%
Possibility 13: Dragonstone armour	< 0.01%

Using these probabilities, the expected average profit/loss, per crystal key, when looting the crystal chest is 13,711. 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.

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: Huge bladed rune salvages	6.00%
Possibility 6: Coal stone spirits and Adamantite stone spirits	10.36%
Possibility 7: Runite stone spirits	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: Large plated rune salvage and Medium plated rune salvage	8.81%
Possibility 12: Large plated rune salvage	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 7,590. Assuming 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 0.0147%.

References

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