Grado Prestige Silver1 Standard (.5 Inch) Mount Turntable Cartridge The Silver and Gold models use a four piece OTL cantilever technology, ultra-high purity long crystal (UHPLC) oxygen free copper wire in the coils and Grado's specially designed elliptical diamond mounted on a brass bushing. The Gold model is selected from the Silver production run and meet higher test specifications. Approximately 5% of the production run meet these standards and become Gold models.