Large violet Austrian crystal stone.
Gold plate base
Stud drop design earrings
"Typically, crystal rhinestones have been used on costumes, apparel and jewelry. Crystal rhinestones are produced mainly in Austria by Swarovski and in the Czech Republic by Preciosa and a few other glassworks in northern Bohemia. In the US, these are sometimes called Austrian Crystal. In the Spanish-speaking world they are called Cristal de Bohemia (Bohemian Crystal)."
http://en.wikipedia.org/wiki/Austrian_Crystal