This stone was sold to me as a Faceted Quartz so I tentatively pass that information along, however in the pursuit of complete honesty, I must also pass along my suspicion that it is faceted glass. I have priced it at the faceted glass level not the faceted quartz level due to that suspicion. Regardless of composition this is a gorgeous necklace! The bail is gunmetal plated brass so it is not recommended for those with sensitive skin.