Signet ring
A ring engraved for sealing — authority pressed into wax, a personal mark made official.
A signet ring in a dream is the dream's image of personal authority that can be pressed into a document and made official. The signet is older than a signature; it tells the reader that this thing came from this person. The dream brings the ring when your authority — in a family, an organisation, a craft — is being asserted or recognised in a way that has a public weight. A signet ring pressed into wax is the dream telling you the mark is being honoured. A signet ring lost or taken is the dream noting that the authority you used to hold has been removed and the documents you used to sign are now signed by someone else.