- Zita 1/5 ct tw Diamond Halo Engagement Ring for Ladies in PlatinumUS$ 900.00Total diamond weight .20ctPurity classic straight 1/6 carat diamond platinum solitaire for ladiesUS$ 1,050.00Total diamond weight .21ctFrances 1/4 carat diamond ring solitaire for ladies in platinumUS$ 938.00Total diamond weight .23ct