Yes. The chief privilege, in fact the only additional privilege above the AGI of the Instrument Ground Instructor (IGI) rating on the Ground Instructor certificate is that it enables the holder to recommend an applicant for the knowledge ("written") exam.
§ 61.215 Ground instructor privileges.
(c) A person who holds an instrument ground instructor rating is authorized to provide:
(1) Ground training in the aeronautical knowledge areas required for the issuance of an instrument rating under this part;
(2) Ground training required for an instrument proficiency check; and
(3) A recommendation for a knowledge test required for the issuance of an instrument rating under this part.