Clarissa frowned. "My thoughts exactly. Goblins are quite known for their ability to detect such counterfeit objects...which makes me wonder if the coins were switched once they had been placed within the owner's vault." She mused. "Which brings us to the point that someone would have to have been able to penetrate Gringott's security to reach those vaults; and that...seems as though it would be difficult to do. Someone would have to be very cunning to accomplish that."

She paused. "Would you believe that it would be simple to fool a regular wizard or witch that the coin is counterfeit?"