ORGANIC BODY PIERCING JEWELRYRock Crystal is a form of quartz. We are not too impressed with the quality of these plugs, which is why we have priced them so low. Rock Quartz is a very brittle material and some of the items have many chips and imperfections. We do however feel that even with these flaws, the material is stunning and these are still beautiful plugs. Sold as a pair. Brand: FreshTrends Age: Adult Condition: New