925 Silver Natural Amethyst Ring — Radiant Cut 2.95ct Fixed UK TNatural Amethyst Ring in 925 Silver Radiant Cut with Cubic Zirconia Side Accents A bold rectangular radiant cut natural amethyst approximately 2. 95 carats set in a four prong solitaire with clusters of brilliant cut cubic zirconia on each shoulder. The deep violet of the stone commands immediate attention, while the cubic zirconia accents add sparkle and balance on either side. The band is solid 925 sterling silver with a clean polished finish. At 3.