2.71 Oval Pink Morganite Engagement Ring in Platinum2. 71 Oval Pink Morganite Engagement Ring in Platinum. This electrifying engagement ring features a 2. 71 carat oval cut pink morganite in platinum. The natural morganite is the color of rosewater and is generous in brilliance thanks to the oval cut of this gorgeous stone. Set in four prongs and accented by four . 08 carat baguette diamonds, this modern engagement ring will surely light up a smile in your loved one!