Since January 2004, "collectors' euro coins" has been used to refer to coins that are not intended for circulation, usually minted in precious metals, with a nominal value and design that are different from those intended for circulation.
They must also differ appreciably from those in circulation in at least two of the following three characteristics: colour, weight and diameter; and they must not have a shaped edge with fine scallops or a ‘Spanish flower’.
Commemorative coins on the other hand are coins intended for circulation as legal tender throughout the euro zone, which meet the following conditions:
The first commemorative euro coin issued in Spain was to mark the quatercentenary of the first publication of the work The Ingenious Hidalgo Don Quixote of La Mancha.
(1) As a rule, euro countries may each issue only two €2 commemorative coins per year. Exceptionally, they are allowed to issue a third, provided that it is one issued jointly and that it commemorates events of Europe-wide importance.