These are 15mm, A grade, Crystal Quartz Star of David pendants with a silver bail and bezel. The silver has an added touch of rhodium to help prevent and prolong the tarnishing process. The Star of David cut gives these Quartz Crystal Pendants a nice reflective quality. Crystal Quartz are known as the "master healers". They are said to stimulate the immune system, cleanse organs and bring the total body into balance.