Anna is a classic round drop that goes with everything. The earring design is available in 4 different sizes. The largest size which is pictured is 20mm and even though its quite big it is light enough to wear the whole day & evening without noticing.
The other sizes are: 16mm, 14mm, 12mm  (some colors available in 18mm.)
Basically all colors are available in these sizes, (metal or gunmetal is not available in all sizes.)