1 Kings 10:18

Moreover, the king made a great throne of ivory
To sit on and judge his people; and ivory being white, may denote the purity, justice, and equity with which he judged; the white throne in ( Revelation 20:11 ) may be an allusion to this; the ivory he had from Tarshish, ( 1 Kings 10:22 )

and overlaid it with the best gold;
for the greater splendour and majesty of it; not that he covered it all over, for then the ivory would not be seen, but interlined it, or studded it with it, whereby it appeared the more beautiful and magnificent. Such a throne of gold and ivory was decreed to Caesar by the Romans ^F16.