Astra Solitaire Ring (Setting )The Astra Setting is a timeless six prong solitaire designed to highlight your gemstones brilliance from every angle. Its balanced crown and open structure allow light to flow freely, creating a bright, radiant sparkle. Handcrafted in 18K Gold or Platinum, Astra fits gemstones from 0. 8 to 3 carats whether diamond, sapphire, ruby, or emerald. A true classic pure, balanced, and made to last forever. Band width 2. 60 mm