Each variant is approximately 40mm tall. They are plated with genuine precious metals and should be fine with sensitive ears. 3rd picture is a pair worn by Toshi Salvino, and the last shows them in rhodium!
Gold comes with a pink bow, and Silver (rhodium) comes with black! They are handsewn and also attached with sewing, which is why those variants are more expensive.
Thanks to screen differences and the fact that all enamel colors are mixed by hand, the end product may be slightly different in color. Please keep this in mind.