This earring comes in three sizes:

Small: pendant 9 mm [0.35 inch] | hoop 11 mm [0.4 inch]
Medium: pendant 20 mm [0.8 inch] | hoop 13 mm [0.5 inch]
Large: pendant 30 mm [1.2 inch] | hoop 13 mm [0.5 inch]

Note that this earring is sold by piece not by pair

How to treat your jewelry: About