Sterling silver, White buffalo turquoise, Orange Kyanite.  Wow what a striking pair of earrings! White Buffalo "turquoise" comes from Nevada.  It is technically not turquoise becasue it has no copper in it which is what makes turquoise blue, but it is found along side of turquoise in the same mines and it is bleached by magnisite.  So....now you know!  The top stones are beautiful faceted Kyanites.  PLEASE NOTE: the stone on the left has a black line at the bottom and you can feel it on the surface.  It is the nature of the stone.  These stones are backed and you should not have a problem with it, but I guarantee my work should you ever do.