(a) Any appointing power may present to an employee who has completed 25 or more years of state service a certificate, plaque, or other suitable memento and the cost of the same shall be a proper charge against the support appropriation of the department or office in which the employee serves. The cost of any certificate, plaque, or memento shall not exceed the sum of ninety dollars ($90).

A presentation may likewise be made to a retired employee who on the date of his or her retirement had completed 25 or more years of state service.

(b) Beginning January 1, 2005, and every five years thereafter, the director may adjust the limit specified in subdivision (a) to reflect the average rate of inflation since the dollar amount was last adjusted.