Gold or Silver in bulk before coining, or valued by weight. (from Oxford Languages dictionary)

The gold standard is fixed monetary regime under which the government's currency is fixed and may be freely converted into gold. It can also refer to a freely competitive monetary system in which gold or bank receipts for gold act as a principal medium of exchange; or to a standard of international trade, wherein some or all countries fix their exchange rate based on the relative gold parity values between individual currencies.

A gold certificate, issued as U.S. currency equivalents until 1934, proves ownership of a specific amount of gold.

1. of or relating to the study or collection of coins, tokens, and paper money. 2: of or relating to currency : monetary (from merriam-webster.com) 

A savings account with tax advantages that individuals can open to save and invest in long term