We noticed that in the jewelry stores they had some of the articles marked “gold” and some labeled “imitation.” We wondered at this extravagance of honesty and inquired into the matter. We were informed that inasmuch as most people are not able to tell false gold from the genuine article, the government compels jewelers to have their gold work assayed and stamped officially according to its fineness and their imitation work duly labeled with the sign of its falsity. They told us the jewelers would not dare to violate this law, and that whatever a stranger bought in one of their stores might be depended upon as being strictly what it was represented to be. Verily, a wonderful land is France!
-Mark Twain, The Innocents Abroad