'Rainbow' in the Bible

And He who sat there appeared like [the crystalline sparkle of] a jasper stone and [the fiery redness of] a sardius stone, and encircling the throne there was a rainbow that looked like [the color of an] emerald.

Then I saw another mighty angel coming down from heaven, clothed in a cloud, with a rainbow (halo) over his head; and his face was like the sun, and his feet (legs) were like columns of fire;