This Conundrum style Teufel Motion Ring has a 4mm Citrine Cabachon and 0.25 carats of full cut Round Brilliant Diamonds. 14k Gold. These unique and eye-catching rings utilize a stainless steel center shaft for strength and durability and a precision ball bearing system for movement. All of the other parts of the ring are solid 14k Gold. This ring is precision engineered with a counter balance to create smooth, fluid movement. Teufel motion rings require virtually no special care (beyond that which you treat your other fine jewelry items) and are VERY durable, providing the fun without the fuss!