Ezekiel 1:22-26

1:22 Over the heads of the living beings was something like a platform, glittering awesomely like ice, stretched out over their heads. 1:23 Under the platform their wings were stretched out, each toward the other. Each of the beings also had two wings covering its body. 1:24 When they moved, I heard the sound of their wings – it was like the sound of rushing waters, or the voice of the Almighty, or the tumult of an army. When they stood still, they lowered their wings.

1:25 Then there was a voice from above the platform over their heads when they stood still. 1:26 Above the platform over their heads was something like a sapphire shaped like a throne. High above on the throne was a form that appeared to be a man.

Exodus 24:10

24:10 and they saw the God of Israel. Under his feet there was something like a pavement made of sapphire, clear like the sky itself.

Revelation 4:2-3

4:2 Immediately I was in the Spirit, and a throne was standing in heaven with someone seated on it! 4:3 And the one seated on it was like jasper and carnelian in appearance, and a rainbow looking like it was made of emerald encircled the throne.