This is a very beautiful ring with a large natural grandidierite gemstone in a halo style with white zircon accents in an 18k yellow gold overlay. Grandidierite is one of the rarest gemstones in the world. The gemstone has natural inclusions and you can see the lines that appear in the pictures. The total carat weight is 6.00! It has the designer hallmark and 925 to prove authenticity. Size 8! New with tags. Sold out everywhere. ** For decades, gem-quality grandidierite large enough to facet was practically unheard of. While some newer deposits in Madagascar and Sri Lanka have increased the supply slightly, high-quality, transparent faceted stones remain incredibly scarce and highly prized by collectors.