1.12 Solitaire Diamond Engagement Ring in 18k Yellow Gold1. 12 Solitaire Diamond Engagement Ring in 18k Yellow Gold. This stunning modern engagement ring features a 1. 12 carat round brilliant cut diamond set in 18 karat white gold over an 18 karat yellow gold band. The shoulders contain . 20 carats of very small accent stones which give a nice shimmer and bit of contrast with the warm yellow gold. From the side, the primary stone is prominently set above the band, which gives the ring a strong presence and