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There is a Legacy version here.

Adamantine ArmorItem 12+

Uncommon 
Source GM Core pg. 228
Usage worn armor; Bulk — varies by armor
Adamantine armor has a shiny, black appearance and is amazingly durable.

Base Material

Adamantine

PFS StandardAdamantine Armor (Standard-Grade)Item 12

Source GM Core pg. 228
Price 1,600 gp (+160 gp per Bulk)
The initial raw materials must include adamantine worth at least 200 gp + 20 gp per Bulk.

PFS StandardAdamantine Armor (High-Grade)Item 19

Source GM Core pg. 228
Price 32,000 gp (+3,200 gp per Bulk)
The initial raw materials must include adamantine worth at least 16,000 gp + 1,600 gp per Bulk.