Retro Transitional Diamond Engagement Ring 14k Yellow and White Gold.  This magnificent Retro engagement ring features a .50 carat transitional cut diamond set in 14 karat white gold. Below the diamond section the shank is finished in 14 karat yellow gold with smooth and thick Retro design. The center stone is set with four (4) flat prongs in a thick section adorned by two (2) smaller accent diamonds. A beautiful example of the Retro style!