When I bought a first pair as a present for my daugter, I was sure that 6mm will look better since she still has small earlobes. However, as we found out 8mm also look immaculate. Sometimes she wears one small and one big, just for a change. Both sizes look really great and the quality is perfect. Emma did a really great job with sending the parcels despite all the turmoil with a post strike. I'll attach a photo of 8mm but don't rely on it for the stone's color. Its changing depending on the surrounding light and the color of clothing (the turtleneck isn't visible on the photo, but it's dark-grey, so seems the stone; with a lighter sweater the stones look blue)

The stones in the studs looks incredible. They absorb light, changing their color from light blue to dark grey. I bought them for my daughter who has grey-blue eyes and this stones match the color exactly. On the bright light they remind of the ocean. Their triangular form looks dainty and uncommon. Just perfect.
Size 6mm fit small ears.