Every notary public shall consistently keep an engraved seal of office or a rubber stamp seal “but not both” which shall clearly show, when embossed, stamped or impressed upon a document, the notary’s name, the notary’s commission number, and the words, “notary public” and “State of Hawaii”. The notary’s seal or stamp must be circular, not over 2 inches in diameter, with “a serrated or milled edge border”.
Source: HAW. Rev. Stat. 456-3 and HAR 5-11-5[c]