Our line of flat top straight side shell stones have a flat back and are commonly used in rings, cuff links and studs with formal wear. Also great for earrings or other applications when you need a flat profile on a piece. As with most natural materials and lapidary hand worked items, some variation in size and color may occur. This material is a Dyed Smoke Grey MOP Base, also sometimes referred to as a Black Tahiti Pearl Color of Shell. It is color enhanced to bring out the natural highlights in the base material.