Major and minor artifacts are listed in several D&D books, but how does one determine their worth? Obviously they are worth something to an adventurer much like a magical location; magical locations are assigned a treasure value but from what I can tell many artifacts are not.
For instance the Naja Fountain from Serpent Kingdoms is basically a magical location (though it is described as an artifact)
The effective arcane caster level of anyone who bathes in the Naja Fountain permanently increases by +3. This benefit can be gained only once per creature. Furthermore, immersion in the fountain's waters confers the benefits of a heal spell for every round of immersion. Finally, any living creature in contact with the fountain's water is immortal and does not age, though these benefits are lost if the creature ceases contact with the water. The water loses all magical powers when removed from the fountain.
Overwhelming conjuration; CL 21st; Weight: N/A (immovable).
Source: Serpent Kingdoms
This is obviously worth a great deal to a player but no gold amount is assigned to it. In contrast magical locations are assigned specific treasure value.
Is there s way to determine artifact value or are artifacts not meant to have a gold value?