4 to 6mm - Ideal for girls, if you are looking for a very simple look or if you want to combine them with other earrings.
7 to 8mm - Perfect for teenagers as well as women looking for something discreet.
8 to 10mm - The most popular sizes, perfect for everyday use, with the 8mm being the most discreet and the 10mm being the most apparent. For reference, a Bic type ballpoint pen measures 8,5mm.
11 to 13mm - Large sizes, ideal if you are looking for pearls that do not go unnoticed.