The setting is Argentium Sterling Silver. The main stone types are blue lapis & dark blue opal doublet. The color overall is royal blue. The overall pendant width is approx. 1-1/4". The overall pendant height is approx. 2-1/2". The thickness is approx. 6 mm. The bail opening size is approx. 5 mm. This is considered a large pendant pendant. This piece is labeled with the Roycroft Renaissance Mark.