These are absolutely gorgeous!  They also come in Blue Topaz.  The larger Smoky Quartz Emerald Cut stone is approx. 10mm including the surround in height and approx. 8mm in width.  The overall drop is approx. 17mm.  They are post and butterfly back.

Metal:  Sterling Silver plated with 14ct Gold

Semi Precious Stones: Smoky Quartz 10 mm x 8 mm; Moonstone

Overall Drop: Approx 17 mm 

Fastening: Post and Butterfly