There is only one throne in heaven:
Revelation 22:1
And he showed me a pure river of water of life, clear as crystal, proceeding from the throne of God and of the Lamb.
it is both the throne of God and the Lamb, because they are One and their name, One
see below, 'throne' is singular - the throne of Christ is the throne of the LORD God; He is the LORD
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Mark 12
28 And one of the scribes came, and having heard them reasoning together, and perceiving that he had answered them well, asked him, Which is the first commandment of all?
29 And Jesus answered him, The first of all the commandments is,
Hear, O Israel; The Lord our God is one Lord:
30 And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment.
31 And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.
"Who is he that condemneth? It is Christ that died, yea rather, that is risen again,
who is even at the right hand of God, who also maketh intercession for us."
(Romans 8:34, KJV)
Jesus and God the Father are One, and Jesus sits at the right hand of the Father on the throne they share together in heaven.
Revelation 21
1 And I saw
a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.
2 And I John saw
the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband.
3 And I heard a great voice out of heaven saying, Behold, the tabernacle of God is with men, and he will dwell with them, and they shall be his people, and God himself shall be with them, and be their God.
4 And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away.
I love these verses because they show how much God loves us. When the New Jerusalem comes down from heaven, God's throne will be there, too! Our God will no longer be a distant abstraction in the third heavens as some perceive Him. He will be physically here on earth, dwelling with us in that awesome city, the New Jerusalem!