Tenn. Code Ann. § 67-6-350: Coins, currency, and bullion

There is exempt from the tax imposed by this chapter the sale of all coins, currency, and bullion that are:

(1) Manufactured in whole or in part from gold, silver, platinum, palladium, or other material;

(2) Used solely as legal tender, security, or commodity in this or another state, the United States, or a foreign nation; and

(3) Sold based primarily on their intrinsic value as precious material or collectible items rather than their representative value as a medium of exchange.