Harry Potter and the Philosopher's was the first LEGO theme based on Harry Potter and the first of the novels. The sets are based on the movie version rather than the book version. There were 15 set released in all 2001 to 2002
Philosopher's Stone consists of 28 sets that ran from 2001 to 2025. As of today,
4709 Hogwarts Castle is the most valuable Philosopher's Stone set with an estimated new/factory sealed value of $371.
Summary
Harry Potter Philosopher's Stone Hogwarts Classrooms set 4721 was released in October 2001, retailing for $10, but has since been retired. New, unopened Hogwarts Classrooms sets are valued at $113, while used sets can be found for $33 in good condition.
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