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There is a Legacy version here.

Potency CrystalItem 1+

Consumable Magical Talisman 
Source GM Core pg. 266 2.0
Usage affixed to a weapon; Bulk
Activate [free-action] (concentrate); Trigger You make an attack with the affixed weapon, but you haven't rolled yet
This fluorite crystal glows with a strange phosphorescence. When you activate the crystal, the weapon becomes a +1 striking weapon on the Strike and until the end of this turn, gaining a +1 item bonus to the attack roll and increasing the damage to two weapon damage dice.

PFS StandardPotency CrystalItem 1

Source GM Core pg. 266 2.0
Price 4 gp

PFS StandardPotency Crystal (Greater)Item 9

Source GM Core pg. 266 2.0
Price 150 gp
The weapon becomes a +2 greater striking weapon for the rest of the turn, gaining a +2 item bonus to the attack roll and increasing the damage to three weapon damage dice.

PFS StandardPotency Crystal (Major)Item 15

Source GM Core pg. 266 2.0
Price 1,300 gp
The weapon becomes a +3 major striking weapon for the rest of the turn, gaining a +3 item bonus to the attack roll and increasing the damage to four weapon damage dice.