My Hanadama studs are 9 mm, and they are pinked, because the natural whites were just too white next to my face. You can see in my photos that the earrings are pinker than the necklaces, which are both silvery white.
My natural white Hanadama rope and Nana's replacement Freshadamas are all 8 mm. (I would have gone smaller on the Freshies, but they didn't have any smaller than 8 mm at the time.) I felt that the studs needed to be either bigger or smaller than 8 mm or it would all look too matchy matchy. Since I'd already owned 7 mm studs, and felt that they were now too small, and I just bought black and white Tahitian studs from Komoka in 9mm and liked the size, I went with 9 mm Hanadamas.
Oddly enough, the white Hanadamas look bigger on my ears than the B&W Tahitians. I remember Jeremy posting that white pearls always look bigger than black pearls. I find that to be true. Of my B&W pair, the light pearl looks bigger than the black one, but when measuring them, they are exactly the same size. And the Hanadamas are equally the same size as the B&W pair, but look bigger than the B&W pair.
Also, I had PP put bigger earring backs on my studs. I find them easier to handle and they make the earrings sit better on my earlobe.
I have a sister-in-law who said, "As I get older, I do not get fatter, but I get thicker." She's right. I swear my earlobes are thicker than they used to be. Old earrings now seem "tight" to me, and too small for my earlobes.