"unwrought precious metal"

means-

(a)precious metal that—
(i)is unrefined (including concentrate and matte), or has been refined to a purity less than 99,9% and has not undergone any manufacturing process other than being refined or formed into a bar (but not a minted bar), an ingot, a button, plate, sponge, powder, granules, (excluding granules made from precious metal that has been refined to or beyond 99,9% purity, and carat gold alloys), solution; or
(ii)is prescribed as any substance, material or product of similar form to any such substance, material or product listed in paragraph (a)(i); or
(b)any article or substance containing or consisting of precious metal contemplated in paragraph (a),

but does not include any article that is of archaeological interest or that has been processed or manufactured for one or more specific industrial, professional or artistic uses.