Of the usual color of a large mass of stone, a cold bluish gray.
The Century Dictionary (Public Domain)
Use "stone-colored" in a sentence
"Another $35,000 was earmarked for the American Civic Association, a stone-colored building where the shootings took place."
"The day of Vladimir Nabokov's death -- July 2, 1977 -- is firmly fixed in my memory, for on the following day Donald Barthelme said casually to me, with a puckish lift of his upper lip and what in non-Barthelmian prose might be described as a twinkle of the stone-colored eye behind wire-rimmed glasses: Happy?"
"The unlikely location of this vision is in proximity to a stone-colored house with a wall."