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There is a Legacy version here.

Adamantine WeaponItem 11+

Uncommon 
Source GM Core pg. 240
Usage varies by weapon; Bulk — varies by weapon
Adamantine weapons have a shiny black appearance and cut through lesser items with ease. They treat any object they hit as if it had half as much Hardness as usual, unless the object's Hardness is greater than that of the adamantine weapon

Base Material

Adamantine

PFS StandardAdamantine Weapon (Standard-Grade)Item 11

Source GM Core pg. 240
Price 1,400 gp (+140 gp per Bulk)
Craft Requirements at least 175 gp of adamantine + 17.5 gp per Bulk

PFS StandardAdamantine Weapon (High-Grade)Item 17

Source GM Core pg. 240
Price 13,500 gp (+1350 gp per Bulk)
Craft Requirements at least 6,750 gp of adamantine + 675 gp per Bulk