How much does it cost to craft a Ring of Ki Mastery? According to the rules for Forge Ring, "To craft a ring, you must use up raw materials costing half of the base price." (http://paizo.com/pathfinderRPG/prd/coreRulebook/feats.html#forge-ring) however when we look at the entry for Ring of Ki Mastery (http://paizo.com/pathfinderRPG/prd/ultimateEquipment/ringsRodsStaves/rings .html#ring-of-ki-mastery) the entry says the craft price is 3420 gold, which is 34.2% of the base price rather than 50%.
With a price of 10,000 GP, the cost to make it cannot be less than 5000 GP (although it could be more, if it is made using a spell with an expensive material component). There is clearly an error here.
The cost in the PRD is incorrect, it is 5,000gp.
CONSTRUCTION REQUIREMENTS COST 5,000 GP
Forge Ring, ki leech, the creator must be able to use ki