Overall, the gold market revolves around the different players in a chain that extends from miners to consumers, including refineries, traders, central banks and investors.
Once the yellow metal is extracted and brought to the surface, the gold trading phase begins. Comex in New York, Royal Exchange in London or Shanghai Gold Exchange, gold is traded all over the world. Its price, often expressed in US dollars, is also defined per 24-hour period.
Note that the majority of transactions are carried out via the over-the-counter or Over The Counter (OTC) market. Investors get there for direct transactions without intermediaries.