A lawyer may communicate the fact that the lawyer does or does not practice in particular fields of law. A lawyer shall not state or imply that the lawyer is a specialist except as follows:
(a) a lawyer admitted to engage in patent practice before the United States Patent and Trademark Office may use the designation "patent attorney" or a substantially similar designation;
(b) a lawyer engaged in admiralty practice may use the designation "admiralty," "proctor in admiralty" or a substantially similar designation; and
(c) a lawyer who is certified as a specialist in a particular field of law by an organization that has been accredited by the American Bar Association may hold himself or herself out as a specialist certified by such organization