D12GX is the "Gyger-2" (fine line) Stylus (for 1012GX cartridge)
D22GX is the "Gyger-1" fine line-contact Stylus.? This product (for 1022GX cartridge)
D42 is called the "Gyger S" (for 1042 cartridge)
All are interchangeable quality levels.
The 1022GX is recommended for the discerning listener. The diamond stylus is a Gyger-1 fine line-contact type, which provides increased resolution and ensures the maximum accuracy of musical reproduction.
Also provides a Genuine OEM stylus for the Roksan Corus Black Cartridge.