2.35 Sapphire & Diamond Engagement Ring in Platinum2. 35 Sapphire Diamond Engagement Ring in Platinum. This modern engagement ring features a 2. 35 carat blue sapphire and . 76 carats of near colorless diamonds finished in polished platinum. The center sapphire has a deep blue hue and is set in four (4) platinum prongs. The rich blue sapphire is accented by eight (8) . 06 carat baguette diamonds and four (4) . 04 round cut diamonds. The square wreath of baguettes and round cut diamonds give the