Here's the fireplace under construction (scan of a film pic taken 2 weeks ago). The camera's flash makes the stones look brown, but they're actually the typical granite gray like the loose ones piled in the foreground. You can see the plywood form that the mason created & used to form the arch, and in the foreground is his scaffolding covered with potential stones. He's just placed the keystone, which he shaped from a stone used in the mansion that once sat on this property.