Cal. Gov. Code § 7551

The Department of General Services shall cause to be designed a series of commemorative gold medallions in not less than 1 troy ounce, 0.5 troy ounce, 0.25 troy ounce, and 0.1 troy ounce sizes of .999 fine gold. As used in this chapter, a “medallion” shall also be known, and may be referred to, as a “gold piece.”