Sterling silver. These are stud earrings with posts and butterfly scrolls on the back.

Left - medium rhomboid (approximate length 13mm, width 9.5mm, thickness 1.7mm)

Centre - small rhomboid (approximate length 10mm, width 7.5mm, thickness 1.5mm)

Right - large rhomboid (approximate length 11mm, width 9.5mm, thickness 1.5mm)