This is a Genuine Gemstones Button Gold Gilt Sterling Button Pierce Back Earrings 7/8"High and wide. Marked sterling in the back, It has got purple stone in the middle may be amethyst but we are not sure  and yellow, green stones on either side, Earrings have Eutrascan style applied wire and bead work on front side .Please see pictures, looks pretty  very nice in condition and would make a lovely gift.

Monkey