Artifact

An artifact is something made or given shape by humans. Back in the old days, anything that is made by human is an artifact. In this day, however, the word has become a term used only for valuable man-made objects.

Grade
Detailed and widely used grading system for artifact did not exist until 3000 BN. The most popular system, which is still being used in the modern days, is the Musō Grading System. A constantly updated bell curve system is used in grading the tools. Instead of being given a rank, an artifact is usually given a score, and its rank will depend on the bell curve.

The official score giver and keeper in the medieval era was Shinshō clan. Musō Group was an alternative legitimate score giver and keeper but due to their secretive nature, the Shinshō was the de facto manager until their extinction. In the modern world, while most countries are still using the same system, there are many different organizations in different countries to manage their respective grading system.

Trivia

 * It should not be confused with wonder, things that are made by nature.