The second, enacted in 1961, identifies the maker. Hallmarks required on continental jewelry go back much farther, to the 14th century in England and the 13th century in France.

Maker’s markings are stamped on jewelry to indicate a piece’s authenticity. These marks are typically of the manufacturer’s initials, name, or a symbol that represents their brand.

View full size Courtesy Designer Jewelry ShowcaseThe pendant that Portland jewelry maker Mark LaJoie created with an 18-carat lemon citrine -- which he calls "Sunrise" -- won the "designer of the ...