Today we read Revelation chapter 4 where John describes his vision of God seated on the throne, as well as the angels, and the sea of glass. He describes God in verse 2-3 like this "(2)...and behold, a throne set in heaven, and One sat on the throne. (3) And He who sat there was like a jasper and a Sardius stone in appearance; and there was a rainbow around the throne, in appearance like an emerald."
God, usually depicted as a bearded man dressed in a white robe, is described here as an amazing array of spectacular colours. Jasper, Sardius, emerald, are just a few precious stones that have been used to describe God's likeness. If you haven't googled it by now, take a moment to look up [Jasper rock], a beautiful deep red stone. Or sardius also a red stone with a slight translucency, also a wonderful saturated red colour.
After finishing Revelation chapter 4, we read Ezekiel chapter 1 in which he goes into more details in regards to the angels and the throne of God, and God's appearance. In chapter 1 verse 26-28 says "And above the firmament over their heads was the likeness of a throne, in appearance like a sapphire stone; on the likeness of the throne was a likeness with the appearance of a man high above it. (27) Also from the appearance of His waist and upward I saw, as it were, the colour of amber with the appearance of fire all around within it; and from the appearance of His waist and downward I saw, as it were, the appearance of fire with brightness all around. (28) Like the appearance of a rainbow in a cloud on a rainy day, so was the appearance of the brightness all around it. This was the appearance of the likeness of the glory of the Lord. So when I saw it, I fell on my face, and I heard a voice of One speaking." Here Ezekiel describes God in the likeness of amber, an orange-red stone, and His throne like sapphire, an amazing blue stone. It simply blew my mind at just how amazing it must have been for these prophets to see the glory of the Lord, the brilliance of His brightness and the overwhelming magnificence of realizing that this vision is of the creator of the universe.