Girls Reserve GR Official Triangle YMCA Lapel Pin Sterling Silver Blue Enamel Marked "Official Sterling" on the back Measures about 1/2 inch in diameter Very good to excellent conditions Girls Reserves, also referred to as ?GR,? is an organization in which young women are introduced to the world of organized community service and self-esteem building skills. GR was created originally through the YWCA, the Young Women?s Christian Association, and was later moved into schools.