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In 3.5e Adamantine cost 250gp/lb for weapons and 150gp/lb for armor. Although in 3.5e Adamantine did several other things
Adamantine Weapon (+1 To hit)(Weapon Damage 1 size larger)(+1 to confirm Crit) (Hardness 20)(Hit points +5) +250gp/lb
Adamantine Armor (Armor Check -1(DR L/Shield=1/-,M=2/-,H=3/-)(Hardness 20)(Hit points +33%) +150gp/lb

Jeraa |

In 3.5e Adamantine cost 250gp/lb for weapons and 150gp/lb for armor. Although in 3.5e Adamantine did several other things
Adamantine Weapon (+1 To hit)(Weapon Damage 1 size larger)(+1 to confirm Crit) (Hardness 20)(Hit points +5) +250gp/lb
Adamantine Armor (Armor Check -1(DR L/Shield=1/-,M=2/-,H=3/-)(Hardness 20)(Hit points +33%) +150gp/lb
Um... no. Adamantines effects haven't changed between 3.5 and Pathfinder. It didn't increase a weapons damage, or increase the critical chance. It did increase a weapons hitpoints though, but not by +5 (it was 40hp/inch compared to 30/inch, so it did increase HP by 33%). Adamantine shields didn't grant DR at all, and costs weren't by weight of the item. (At least thats what the DMG says. I don't remember it being changed in any other book though.)
As for shield cost, the Hypertext SRD site puts it at 2000 gp for an adamantine shield, while the 3.5 FAQ says 5,000.
A per-pound price of adamantine has never been given (as far s I know), but since mithral is 500gp/pound, and adamantine is usually at least 2x as expensive, pricing it at 1000gp/pound if probably what I would do. (The Draconomicon does say a 1 pound bar of adamantine is 100 gp, but it also says a 1 pound bar of mithral is 100gp, which is wrong.)

Ravingdork |

A shield is a weapon, therefore 3,000gp.
Seems appropriate. Now if there was only a way to determine the cost of other adamantine items.
That's easy. Those other items are improvised weapons. Improvised weapons are weapons, hence the word in its name. Therefore, they cost an additional 3,000gp as well.
;P

Jo Bird |

Abraham spalding wrote:A shield is a weapon, therefore 3,000gp.blackbloodtroll wrote:Seems appropriate. Now if there was only a way to determine the cost of other adamantine items.That's easy. Those other items are improvised weapons. Improvised weapons are weapons, hence the word in its name. Therefore, they cost an additional 3,000gp as well.
;P
Agreed.
And as improvised weapons they can be used to sunder items.

Kelvar Silvermace |

I know this is far from canon as Pathfinder legal, but 3.5's Dungeonscape (page 30) has:
Adamantine Drill 200gp, weight 1 lb.
Adamantine Hacksaw 600gp, weight 1 lb.
Adamantine Manacles 2,000gp weight 5 lb.
I don't know if this helps, but perhaps one could extrapolate from here?

Jeraa |

Provos wrote:Adamantine Crowbar 1252gp 1d8 bludgeoning (+1 to hit & damage)(+1 to crit confirm) since Adamantine is considered mw I would increase the circumstance bonus on Strength checks from +2 to about +5. YMMVwhy do yo think adamantine gets +1 damage, and to confirm crits?
As he mentioned before, he uses a 3rd party product. ""Planer Metals, version 3.5E" by Ken Lipka Based on the 3E system by Ken Lipka, Rick Coen, and Josh Rintamaki".
Edit: Actually, having found what he is talking about (here), it not even a 3rd party product. Its houserules.

Cheapy |

I know this is far from canon as Pathfinder legal, but 3.5's Dungeonscape (page 30) has:
Adamantine Drill 200gp, weight 1 lb.
Adamantine Hacksaw 600gp, weight 1 lb.
Adamantine Manacles 2,000gp weight 5 lb.I don't know if this helps, but perhaps one could extrapolate from here?
Hmm, dungeonscape, the book Jason Buhlman wrote?

Kelvar Silvermace |

Kelvar Silvermace wrote:Hmm, dungeonscape, the book Jason Buhlman wrote?I know this is far from canon as Pathfinder legal, but 3.5's Dungeonscape (page 30) has:
Adamantine Drill 200gp, weight 1 lb.
Adamantine Hacksaw 600gp, weight 1 lb.
Adamantine Manacles 2,000gp weight 5 lb.I don't know if this helps, but perhaps one could extrapolate from here?
Yes. Along with Rich Burlew, it appears. Great book, in my opinion.

blue_the_wolf |

I still have yet to find a good example. I have found examples with a price, but no weight, and examples with weight, but no price. Anyone find an example with both?
I know this is a bit extreme but check out the adventure paths.
they are always tossing in silly little things that you can use as an refferance. In one adventure for example players find an adamantium chisel during the first book of the adventure. (I dont remember the path or any kinds of stats/costs but you can try to find it... (not rise of the runelords or serpents skull))
outside of that you can reverse engenier things. such as look at the weight of an item and devide the cost by the wight for a rough estimate of per weight costs. you will get different numbers but its a starting point.
lasly you can make things up. the adamantium and mythreal value rules are all basically quick and dirty references. nothing in the game says they HAVE to be costed as the book states. In one of my game worlds for example gnomes are the only race that knows how to craft mythreal (which in game is essentially titanium alloy) the cost of mithreal items is very much influenced by trade relations with the gnome city
or simply base it on the value to the characters. an adamantium hammer and adamantium manacles may weigh the same but you can say the manacles cost a whole lot more due to complexity (though you really make them cost more because the manacles have a greater value to the group and higher in game exploit ability)

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There has just been too many times within games that I have thought "I wish I had an adamantine version of this". If through a number of examples I reverse engineer a price/weight cost factor, I can come up with whatever the item is, and have a appropriate price. I am sure all of us has had the thought "does this come in adamantine?"

blue_the_wolf |

I understand the concept...
but I wonder if that's reasonable.
what i mean is that mithral and especially adamantium are supposed to be rare and nearly magical. in fact adamantium weapons and armor (though often given as low level rewards) should on a grand scale be much more rare than magical weapons and armor.
making every bauble and trinket out of adamantium may indicate other problems with the game world.

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A rule of thumb may be to price it based on its relative size compared to weapons. For example, if the item you wish to craft is small, maybe use the base price of an Adamantine Dagger as your starting point. If it's a little larger, use the Short Sword price, etc.
This can at least ball park it for you.

Cheapy |

Armor Mithral Adamantine
Light 1k 4k
Medium 4k 10k
Heavy 9k 15k
Light armor is 4x more expensive
Medium is 2.5
Heavy is 1.667
Average those to get 2.722 times more expensive.
500 gp / lb for Mithral.
500 * 2.722 = 1361 gp / lb, round up to 1,400 gp.
Alternatively, 50 arrows weigh 3 lbs. This means that each arrow weighs .06 lbs.
Each arrow costs 60 gp to make adamantine, so for a cost of 1,200gp per quiver.
But that's irrelevant. Since with 60 gp per arrow, and each arrow weighing .06, that's a cost of 1k gp per pound.
Soooo, let's average these values to get 1,200 gp per pound.

mdt |

I sat down one time in 3.5 and calculated the 'average' cost of Adamantine across the different armors.
Light armor
Chain shirt - 25 lbs.
Medium armor
Scale mail - 30 lbs.
Chainmail - 40 lbs.
Breastplate - 30 lbs.
Heavy armor
Splint mail - 45 lbs.
Banded mail - 35 lbs.
Half-plate - 50 lbs.
Full plate - 50 lbs.
Base armor cost is not involved, so, for each for adamantine we have the added cost as :
Light : 5,000
Medium : 10,000
Heavy : 15,000
So that's :
(5,000 + (10,000 x 3) + (15,0000 x 4)) for costs, or 5K + 30K + 60K = 95,000 GP
Weights are 25 + 30 + 40 + 30 + 45 + 35 + 50 + 50, or 305 lbs
Average is 95,000 / 305 = 311 gp / lb.
Which doesn't make any sense, obviously. However, then I realized I can set up a ratio between the costs of Mithral and the pound per mithral.
So, same armors cost (1,000 + (4,000 x 3) + (9,000 x 4)) or 49,000 gp.
If we divide the 49,000 by 305 we get 160.6557 gp per lb. Since that's not 500, we can set up a ratio (I put the diff down to the armors not being solid metal). So, 500 / 160.6557 = 3.11.
Thus we multiply the 311 gp/lb for Adamantine we got before by the ratio for Mithral, and we get (311 * 3.11) = 967.21 gp. Which I round up to 1,000 gp / lb.
It works out well enough in my games, to be honest. I found it mildly ironic that the ratio was exactly 1/100th the value for Adamantine. :) I'm weird that way about numbers.

Jeraa |

*math*
Remember that crafting an item requires 1/3rd the cost in materials. The rest is labor. So the cost of the adamantine for armor is actually 1.6k/3.3k/5k in adamantine. The numbers change, but since they change for both mithral and adamantine, you final result is still the same - 1,000 gp/pound for adamantine.
So an adamantine coin is only worth double that of a platinum coin in your games?
That seems remarkably low to me.
With the prices listed in the book, either adamantine can't be that rare, or all adamantine items are actually just plated in adamantine and not solid and so only contain a small portion of adamantine.
And why compare it platinum, which would be rare on its own? Compare it to 1 pound of gold (adamantine is 20x as expensive), silver (200x as expensive) or iron (10000x as expensive). Especially iron or steel, as that is the material that adamantine usually replaces.

MJBurrage |

Unlike mithral, adamantine does not have a price listing for items that are not armor or weapons. How does one determine the cost of items outside of these parameters? What about adamantine shields?
Shields
In the 3.0 DMG and SRD, adamantine shields cost the same as light armor (+2,000 gp). The 3.5 DMG and SRD raised the light armor cost (+5,000 gp) and no longer listed a separate shield cost. This led to most SRD compilations by third parties (Hypertext d20 SRD, D&D Wiki, etc.) listing the 3.0 shield cost in their 3.5 SRDs. However, the v.3.5 Main D&D FAQ confirms that a 3.5 adamantine shield still costs the same as light armor (+5,000 gp)
Pathfinder is to my knowledge silent on the issue.
Other Items
As noted by others, raw materials cost one-third of an item's price. Therefore, one can calculate a ceiling for the raw material value by dividing a known item price by three, and then by the item's weight in pounds. Doing this for adamantine armor and weapons yields a range of ceiling values, with the notable ones detailed below (everything else has a raw material ceiling value over 100 gp).
If the raw material value of adamantine is set above an item's calculated ceiling value, than a character could simply buy that item, melt it down, and sell it back to the crafter for a profit.
The lowest ceiling for the raw material value of adamantine is from a sling bullet (60 gp price for a 1/2 lb. bullet = 40 gp/lb. raw material cost) which is lower than gold (50 gp/lb.), and would make the base price for adamantine other items 120 gp/lb.
The next lowest ceiling is from a chain shirt (5100 gp price for a 25 lb. shirt = 68 gp/lb. raw material cost), which would make the price for adamantine other items 200 gp/lb. However one has to either custom rule adamantine sling bullets, or raise their price to 100 gp each.
After that we have chainmail and the greataxe (both work out to ~84 gp/lb. raw material cost), which would make the base price for adamantine other items 250 gp/lb. However one has to either ignore both chain shirts and sling bullets, or tweak the rules for both. The chain shirt either weighs 20 lb. or it is priced at 6,350 gp. Sling bullets would have to be custom ruled, or priced at 120 gp each.
In my games, I ruled that—since a mithral chain shirt weighs 10 lb.—a masterwork steel chain shirt (and thus an adamantine chain shirt) weighs 20 lb., and that adamantine sling bullets are priced at 120 gp.
P.S. The same methods applied to mithril show that:
The lowest ceiling for the raw material value of mithral is from a chain shirt (36.7 gp/lb.), which implies that the price for mithral other items should by 55 gp/lb. (using original item weight) or 110 gp/lb. (using mithril item weight)
The next lowest ceiling is from a heavy shield (68 gp/lb.), which would suggest a price for mithril other items of 100 gp/lb. (original item weight) or 200 gp/lb. (mithril item weight) However the price of mithral shirts would have to be increased by raising the price of light armor to +2000 gp.
I.E. if you put the raw material value of adamantine and mithril much higher than gold, than anyone can make a profit by buying chain shirts and immediately selling them for their metal content.

Cult of Vorg |

Adamantine mug or screwdriver for use as an improvised weapon that can bypass that DR.
Adamantine drill, hacksaw, carving knife, etc, for use against objects otherwise too tough to consider cutting into.
Adamantine arcane bond or holy symbol to protect against sunders.
Glass-steel and adamantine eyeglasses, for the nearsighted sick of accidental damage.
Lead-lining an adamantine container for ultra safe storage.
An adamantine coated summoning diagram to further lessen chances of the beastie getting free.
Adamantine threaded cable, for moving weight past the tensile strength of steel but still within the barbarian's light load.
That's off the top of my head, i'm sure there's plenty of other uses.

MJBurrage |

Adamantine is listed in Ultimate Equipment under Trade Goods as 300gp/lb. There are no formulas (that I saw) that mention what it costs to create non weapon/armor items out of it.
The problem with a 300 gp/lb. value for adamantine, is that at that price there are many official adamantine items that if purchased at their official market price, and then melted down would yield a large profit.
The most egregious example being a 5,100 gp adamantine shirt weighing 20–25 lbs (see above). Any player could just buy the shirt and melt it down to get adamantine for ~250 gp/lb. And to craft such a shirt, the armorer must have a supplier willing to sell adamantine for 1/3 of that (~85 gp/lb)

ThePreacher |
On the magic weapons page of the Paizo PRD (http://paizo.com/prd/magicitems/weapons.html) it lists both an Adamintine dagger and Adamantine Battleaxe. It looks like the cost to create such things is 3000 gp plus the normal cost. I think from that you can conclude that weapons cost +3000 gp. It makes sense that other items also have a +GP cost (like your drill or manicles) although what that is is harder to determine.