'Ivory' in the Bible

Also the king made a great throne of ivory and overlaid it with the finest gold.

For the king had at sea the [large cargo] ships of Tarshish with the ships of Hiram. Once every three years the ships of Tarshish came bringing gold, silver, ivory, monkeys, and peacocks.

Now the rest of Ahab’s acts, and everything that he did, the ivory palace 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?