Christ said: No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him. (John 1:18) Comparing scripture with scripture teaches that Christ was referring to seeing the full glory of God. A few, such as Moses, have seen to a limited degree the glory of the Father.
When Moses prayed: I beseech thee, shew me thy glory. And he said, I will make all my goodness pass before thee, and I will proclaim the name of the Lord before thee; and will be gracious to whom I will be gracious, and will shew mercy on whom I will shew mercy. And he said, Thou canst not see my face: for there shall no man see me, and live. And the Lord said, Behold there is a place by me, and thou shalt stand upon a rock: And it shall come to pass, while my glory passeth by, that I will put thee in a clift of the rock, and will cover thee with my hand while I pass by: And I will take away mine hand, and thou shalt see my back parts: but my face shall not be seen. (Exodus 33:18-23) This was not just a likeness, such as Daniel saw in Daniel 7; Moses actually saw God the Father.
Some say that men do not see God; they only see a visual representation of Him, and that God, being Spirit, cannot be seen. But if this were the case, why did God say: Thou canst not see my face. So God who designed the laws of physics designed laws that enabled Moses to see God who is Spirit. Spirits can sometimes be seen. When the disciples saw Jesus walking upon the sea, at first: they supposed it had been a spirit. (Mark 6:49) When the Father appeared to Moses it was a special privilege for Moses alone, as he left no record of what he saw.
Whenever men saw God the Father, it was necessary, as with Moses, that God’s glory be mostly obscured. When Isaiah saw God (Isaiah 6:1-5) the wings of the seraphim, who dwell in God's presence, covered his face. When Ezekiel saw God, His glory was veiled by fire.
Ezekiel wrote of the glory: upon the likeness of the throne was the likeness as the appearance of a man above upon it. (Ezekiel 1:26) So when God said that man was created in the image of God (Gen 1:27) reference was made to physical appearance as well as to spiritual faculties. Not that God looks exactly like a man, but only that He bears some similarities. From the dimensions of the mercy seat (Exodus 25:17), it may be understood that God is almost twice as tall as a man, but not twice as broad. (the temple contained no image of God, which is idolatry, but only a place where it was symbolised that he should sit)
In reality the God of glory is seated upon: the likeness of a throne, as the appearance of a sapphire stone. (Ezekiel 1:26) Although sapphire is a usually a blue gem, named for its beauty and splendour, sapphires can also be golden. The throne is the colour of a glorious golden sapphire, reminding us of kingly rule. That sapphires can also be blue reminds us that God's throne is over all like the blue of the sky.
John saw the Father and wrote: one sat on the throne. And he that sat was to look upon like a jasper and a sardine stone. (Rev 4:2,3) Jasper speaks of clearness (Rev 21:11) and sparkling with light. God being Spirit rather than having a body has a degree of clearness. Sardine stone is deep red, and this reminds us of heat. God, who designed the laws of physics, ordained that red should signify heat. Not that God contains heat like a physical object. (He is Spirit.) But rather we are reminded of the intense energy that God possesses. Such energy as could create a universe with a hundred billion galaxies, each with a hundred billion stars.
Ezekiel, who also saw the Father wrote: I saw as the colour of amber, as the appearance of fire round about within it, from the appearance of his loins even upward, and from the appearance of his loins even downward, I saw as it were the appearance of fire, and it had brightness round about. (Ezekiel 1:26,27) From a disc in the place of a man's belly, comes amber fire, lighting up the surrounding environment. This reminds us that: our God is a consuming fire. (Heb 12:29)
John also writes: there was a rainbow round about the throne, in sight like unto an emerald. (Rev 4:3) Emerald is a blue green gem, translucent as are all gems. Lest we should fear to communicate with such a God, we should remember that God told Noah that the rainbow is a token of God's covenant of peace. (see Genesis 9:13) God has made a covenant so that we may have: boldness to enter the holiest (heaven) by the blood of Jesus. (Hebrews 10:19)
So, can we believe it, that we have a description of the God of glory? Although when we see God, His glory and the clarity of the vision will infinitely surpass what we can now glean from the scriptures, I urge you not to discount the revelation God has given, though it may be through a glass darkly. From time to time meditate upon the appearance of God’s glory, that your prayers may commence with more focus.