Gray-Blue Rhinestone Grape and Vine Clusters Screw Back Earrings

A pair of gray-blue chaton grape shaped non-pierced earrings on a gold tone base.  The earrings are affixed with a screw back attachment and measure 3/4" across and 1 1/4" tall.  The maker is unknown and the condition is good but with some light loss to the luster on one of the "grapes" as noted in the images.