The shape of a throne with the appearance of sapphire stone was above the expanse. There was a form with the appearance of a human on the throne high above.

Then I looked, and there above the expanse over the heads of the cherubim was something like sapphire stone resembling the shape of a throne that appeared above them.

You were in Eden, the garden of God.
Every kind of precious stone covered you:
carnelian, topaz, and diamond,
beryl, onyx, and jasper,
sapphire, turquoise and emerald.
Your mountings and settings were crafted in gold;
they were prepared on the day you were created.