Aureus ancient coins from the Roman Empire
Very rare and usually prohibitively high-priced, gold aureus coins are some of the most collectible and rare Ancient Roman coins.
Many aurei for sale these days are modern reproductions, which is the only way most collectors will ever have an ancient Roman aureus coin in their collection. This is certainly a valid way to do it, since authentic aurei are very rare and generally reserved for the most deep-pocketed individuals and organizations. If you are looking for a replica aureus, note that such copies should be clearly marked, in the listing and sometimes on the coin itself.
But yes, there are also a few actual authentic aureus coins for sale, and if you are in the market for one it is worth watching online sales listings.