Wash. Admin. Code § 460-300-010
For the purposes of RCW 21.30.010(17), the term "precious metal" includes:
[Statutory Authority: RCW 21.30.400, 21.30.010 (17)(d), and 21.30.040 (1)(b). WSR 14-03-022, § 460-300-010, filed 1/7/14, effective 2/7/14.]