'Gold of Ophir' in the Bible

Three thousand talents of gold from gold of Ophir, and seven thousand talents of purified silver, to spread over the walls of the houses:

It shall not be weighed with gold of Ophir, with the precious onyx, and the sapphire.

King's daughters among thy beautiful ones: the queen stood at thy right hand, in gold of Ophir.

I will make a man precious above pure gold, and a man above the gold of Ophir.