The setting is Argentium Sterling Silver. The main stone type is mosaic mother of pearl. It as a crackled face in the mother of pearl and is completely sealed. The color is white with a slight rainbow of colors. At the top are little silver accent beads. The overall pendant width is approx. 1". The overall pendant height is approx. 2". The thickness is approx. 4 mm. The bail opening size is approx. 7 mm. This is considered a medium pendant. This piece is labeled with the Roycroft Renaissance Mark.