Maryland Tax - General Section 11-214.1
§ 11-214.1.
  (a)   In this section:
    (1)   "precious metal bullion or coins" means:
      (i)   any precious metal that has gone through a refining process and is in a state or condition such that its value depends on its precious metal content and not on its form; or
      (ii)   except as provided in paragraph (2) of this subsection, monetized bullion, coins, or other forms of money that:
        1.   are manufactured from precious metals; and
        2.   are or have in the past been used as a medium of exchange under the laws of the State, the United States, or a foreign nation; and
    (2)   "precious metal bullion or coins" does not include jewelry or a work of art made of precious metal bullion or coins.
  (b)   The sales and use tax does not apply to a sale of precious metal bullion or coins if the sale price is greater than $1,000.