There is exempted from the taxes imposed by this chapter:
(1) The sale of precious metal bullion or the sale of monetized bullion.
(2) For purposes of this section, “precious metal bullion” means any elementary precious metal which has been put through a process of smelting or refining including, but not limited to, gold, silver, platinum, rhodium, and chromium, and which is in such state or condition that its value depends upon its contents and not upon its form.
(3) For purposes of this section, “monetized bullion” means coins or other forms of money manufactured from gold, silver, or other metals and heretofore, now, or hereafter used as a medium of exchange under the laws of this state, the United States, or any foreign nation, but shall not include coins or money sold to be manufactured into jewelry or works of art.