This Exquisite Engagement Ring Boasts A Remarkable 30.01 Ct Blue Topaz Stone, Elegantly Set In Platinum 900. It's No Surprise That Blue Topaz, A Semiprecious Gemstone, Is So Highly Coveted - Its Mesmerizing Hue Is Truly Breathtaking. Ring Size: 7.75 Us, Resizable Metal: Platinum 900 Stone: Topaz, Blue Topaz Stone Cut: Emerald Cut, 30.01ct Ring Top: 20.1mm Retail $4,500 Appraisal Is Available With A Fee; Local Jeweler Is $70, Gia Lab Is $120