The Collegiate Standard Phi Mu Sorority Infinity Ring (sterling silver) A simple and chic Phi Mu sorority infinity ring made by The Collegiate Standard Materials: 925 Sterling Silver - Rhodium Finishing Officially Licensed Product - passed through stringent requirements by the sorority. In addition, part of the sales proceeds goes back to Phi Mu Select ring size in drop down menu / Available ring sizes: 5 6 7 8 9 The perfect gift for any M member!