Collections of ancient coins can reach very high values, but there are also contemporary coins that can be worth significant amounts, especially if they are rare or commemorative coins. A notable example is Monaco's 2 euro coin, minted in 2007.

For a coin to be worth substantially more than its value, it must have several specific characteristics, such as the size of the print run, the edition, the presence of errors, rarity and, often, historical relevance, such as tributes or commemorations.

It is very important to seek advice from an expert to understand the characteristics of the coin and its real value, as only specific coins can achieve high values, and proper advice helps to avoid possible scams.

This particular coin was minted to commemorate the 25th anniversary of Princess Grace Kelly's death and had a print run of only 20,001 copies, all of which were proof quality and presented in their own case. Its value reached 2,600 euros, according to El Economista's quote in the "Coin Collectors" ranking.

The coin was issued on July 1, 2007, and consists of a nickel core clad in nickel-brass. It weighs 8.6 grams, has a diameter of 25.75 mm and a thickness of 2.2 mm.