'Ivory' in the Bible

Moreover, the king made a great throne of ivory and overlaid it with refined gold.

For the king had at sea the ships of Tarshish with the ships of Hiram; once every three years the ships of Tarshish came bringing gold and silver, ivory and apes and peacocks.

Now the rest of the acts of Ahab and all that he did and the ivory house which he built and all the cities which he built, are they not written in the Book of the Chronicles of the Kings of Israel?