The Companion Ring can be worn as a classic ring, but also very contemporary as a stacking ring - to match your diamonds. it's made in 18 K gold. This ring is made by hand with much love and care in the Rivour & Guya studio in the Black Forest, Germany. The gold used in all Rivour & Guya rings is ecologically river gold from Germany, mixed with recycled gold (Mass Balance Principle). The diamonds used in Rivour & Guya are of a very high quality. The diamonds are at least the G color and SI clarity and they all come from Canada (Deviak and Ekati mine) and are cut exclusively in RJC certified manufactories.