4 Carat Diamond Eternity Band in White Gold4 Carat Diamond Eternity Band in White Gold. This diamond eternity band features 4. 50 carats of white and brilliant oval diamonds. The oval diamonds are in a shared prong setting constructed in 18 karat white gold. The exposed girdle of the oval diamonds creates an all diamond appearance with a glittering refraction of light. This band has enough impact to be worn alone or could help create a lovely stack.