Collectible coins, particularly those from the United States, encompass a wide range of types, including gold coins such as the Twenty-Dollar Gold Coin, also known as the Double Eagle. These coins were minted from 1849 until 1933 and are highly sought after by collectors due to their gold content and historical significance. The Colorado Gold Rush in the mid-1800s contributed to the creation of various gold coins, which reflect both the economic conditions of the time and the era's artistry in coin design. Collectors often focus on the rarity, condition, and historical context of these coins to determine their value.