- 1/4 carat diamond simple and elegante 18k and platinum solitaire for ladies$1,450.00Total diamond weight .23ct1/3 carat diamond simple and elegante 18k and platinum solitaire for ladies$1,250.00Total diamond weight .34ctSacré-Coeur 14K Gold 2-Tone 2.00CT Diamond Solitaire with Heart Prongs and Surprise Diamonds Engagement Ring$11,500.00Total diamond weight 2.08ct