'Gold of Ophir' in the Bible

Even three thousand talents of gold of Ophir and seven thousand talents of the best silver, for plating the walls of the house:

And put your gold in the dust, even your gold of Ophir among the rocks of the valleys;

It may not be valued with the gold of Ophir, with the onyx of great price, or the sapphire.

Kings' daughters are among your noble women: on your right is the queen in gold of Ophir.

I will make men so small in number, that a man will be harder to get than gold, even the best gold of Ophir.