Although signet rings aren’t as prominent in society today as they once were, they are still an accessory with immense cultural and historical significance. Traditionally, signet rings were worn on the pinky finger and used by gentlemen, particularly gentlemen involved with business or politics, as a seal to sign important documents. Engraved with the wearers family crest, the signet ring would be dipped into hot wax before being used to print a signature.
As signet rings were technically the signature of the wearer, they were often considered so powerful that they were destroyed after the man’s death. Most commonly these signatures were a coat of arms or a family crest, but they could also be simple symbols and other combinations of letters or distinct patterns. Above all else, the signet ring represents power, authenticity and the individuality of the owner.
https://www.alicemadethis.com/blogs/journal/which-finger-to-wear-your-signet-ring-on