Grandidierite is known to be one of the rarest gemstones available. They originally were discovered in Madagascar, and are beautiful stones that have a blue/green color. They are a relatively hard stone, ranking a 7 or 7.5 on the Mohs scale of hardness. This halo ring is made with a real grandidierite stone and has real zircon accents surrounding it. The metal on both the ring is solid .925 sterling silver with a platinum plate. If you want a rare stone to add to your collection, this piece is perfect. The ring in the photos is the one you will receive! Natural stones oftentimes have natural imperfections, so please see pictures for quality :) Brand new. J13