Signet rings, the bold gold, monogram, family and school-crest engraved jewelry staples that never go out of rotation in our wardrobes, used to signify royalty and power in a community. The rings originated in ancient Rome as symbols of victory for generals and then gained popularity again in 17th century England, when they became the preferred way of singing letters with one's seal. The seal validated the authenticity of its owner and any acts or contracts executed on his behalf as a true signet ring leaves a raised design in wax, hence the popular expression "signed, sealed and delivered".
Today's signet rings might not be used for letter-sealing and the theft of one may no longer be punishable by death, but there are certainly a few royal styles on the market. Above, a few favorites: James Colarusso's concave version, Tiffany& Co.'s standard oval, Max & Chloe's magnolia design, JCrew's simple circular style and Jennifer Zeuner's bold and boxy option.