What's the cost of a adamantine double weapon?

[Matt2VK]

What's the cost of a adamantine double weapon?

Example: 2-Bladed Sword

What if you wanted to make one blade Cold Iron and the other Adamantine?

[Rynjin]

Double weapons count as two different weapons for all that stuff. One side can be one thing, the other side can be another.

If you want it Cold Iron + Flaming on one side and Adamantine + Frost on the other, go for it.

Costs separately for each, though.