Severus was laughing in his office since he was aware that the stone that Albus had was a well-made fake. Not even Voldemort would realise it, if the stone was the real one or a fake. He could image, what Dumbledore’s face would look like, if he found out that the stone was a simple ruby stone that was useless. Severus could imagine, what fit Albus would throw in his office.