Amulet of chemistry

The RuneScape Wiki also has an article on: rsw:Botanist's amulet

Amulet of chemistry
Released							2 February 2017 (Update)
Members							Yes
Quest item							No
Properties
Tradeable							Yes
Equipable							Yes
Stackable							No
Noteable							Yes
Destroy							Drop
Examine							Useful when making potions - has the chance of giving an extra dose.
Values
Value							1,050 coins
High alch							630 coins
Low alch							420 coins
Weight							0.007 kg
Grand Exchange
Exchange							964 coins (info)
Buy limit							10,000
Daily volume							62,805
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Advanced data
Item ID							21163

An amulet of chemistry is a jade amulet enchanted via the Lvl-2 Enchant spell.

Each amulet begins with five charges. While the amulet is equipped, there is a 5% chance that you will create a 4-dose potion rather than a 3-dose potion when brewing potions (but with no extra experience), which consumes one charge. Once all of the amulet's charges are used up, the amulet crumbles to dust.

Similar to a ring of recoil, amulet of chemistry charges are stored per player, not per amulet. Thus if the player sells or casts High Level Alchemy on an amulet with 1 charge remaining, the next amulet the player equips will still have only 1 charge. The player can right-click to "break" an amulet of chemistry, destroying it and restoring the next amulet of chemistry the player equips to 5 charges.

Attack bonuses
+0		+0		+0		+0		+0
Defence bonuses
+0		+0		+0		+0		+0
Other bonuses								Slot
+0		+0		+0%		+0		List

Creation

Requirements

Skill		Level	XP
Magic		27 (b)	37
Members		Ticks	1 (0.6s)

Materials

Item		Quantity	Cost
	Jade amulet	1	738
	Cosmic rune	1	152
	Air rune	3	12
Total Cost			902
	Amulet of chemistry	1	964
Profit			62

Mechanics

The amulet of chemistry provides no benefit when making potions that always output 4 doses, including antidote+, antidote++, anti-venom+, super combat potion, and super antifire.

When used with potions that create a variable number of doses, the amulet will only trigger if the input potion is less than 4 doses. These potions include stamina potion, extended antifire, extended super antifire, anti-venom, and all of the divine potions. When used with 3-dose potions, the amulet will extend 60 doses into 61 doses, providing an average 1.66% increase in yield and take 33% longer to make. For 2 dose potions, the amulet will extend 40 doses into 41 doses, providing an average 2.5% increase in yield and take 100% longer to make. For single dose potions, the amulet will extend 20 doses into 21 doses, providing an average 5% increase in yield and take 300% longer to make. This takes much more time, but can be useful extending supplies when acquiring ingredients takes a significant amount of time (such as on Ironmen accounts, or maximising profit from crystal dust).

Profit

When using the amulet for solely profit, it should only be used when a single dose of the potion you make has a value of more than 1/5th of the amulet's worth (192.8).

Potion		Single dose		One dose of (4)
		GE Price	Profit	GE Price	Profit
	Attack potion	2	-190.8	1	-191.8
	Antipoison	68	-124.8	53.5	-139.3
	Relicym's balm	395	202.2	210.5	17.7
	Strength potion	73	-119.8	88	-104.8
	Serum 207	3	-189.8	1.5	-191.3
	Compost potion	96	-96.8	72	-120.8
	Restore potion	32	-160.8	23.25	-169.55
	Guthix balance	260	67.2	68.75	-124.05
	Energy potion	140	-52.8	144.75	-48.05
	Defence potion	96	-96.8	70.25	-122.55
	Agility potion	101	-91.8	57	-135.8
	Combat potion	108	-84.8	178.25	-14.55
	Prayer potion	2,318	2,125.2	2,327.75	2,134.95
	Super attack	37	-155.8	35.5	-157.3
	Superantipoison	90	-102.8	66.25	-126.55
	Fishing potion	48	-144.8	39.75	-153.05
	Super energy	547	354.2	469.75	276.95
	Hunter potion	1,147	954.2	1,128.5	935.7
	Super strength	410	217.2	389	196.2
	Super restore	2,809	2,616.2	2,785.5	2,592.7
	Super defence	267	74.2	221.25	28.45
	Antifire potion	53	-139.8	41	-151.8
	Divine super attack	378	185.2	255	62.2
	Divine super strength	901	708.2	796.75	603.95
	Divine super defence	681	488.2	430.5	237.7
	Ranging potion	86	-106.8	77.75	-115.05
	Divine ranging potion	640	447.2	1,048.25	855.45
	Magic potion	48	-144.8	42.75	-150.05
	Divine magic potion	516	323.2	1,068.25	875.45
	Stamina potion	1,389	1,196.2	1,341.25	1,148.45
	Zamorak brew	746	553.2	382.25	189.45
	Bastion potion	2,114	1,921.2	2,205.25	2,012.45
	Battlemage potion	1,589	1,396.2	1,516.25	1,323.45
	Saradomin brew	1,193	1,000.2	1,201.25	1,008.45
	Extended antifire	139	-53.8	117	-75.8
	Anti-venom	1,013	820.2	779.25	586.45
	Divine super combat	4,450	4,257.2	4,257.25	4,064.45
	Extended super antifire	2,265	2,072.2	2,333	2,140.2