All the structures were built of gray stone, as was the courtyard floor.

The formerly light gray stone had become a deep, dark black.

The house itself was three stories high, made of the same gray stone, which gave it a medieval look.

And Aaron's eyes were two pieces of cold gray stone.

The buildings were of white and grey stone, some more than four levels high.

He might as well have touched the gray stone of the hold and asked it for an answer.

After a while the gray stone of the hold appeared through the haze.

Richard walked out of the station and down some gray stone steps.

The walls and floor of her prison were cold gray stone.

There were other doors in the grey stone of the walls.