Hi Valeria101,
Not necessarily, I have a Sea of Cortez blue/silver pearl which is app. 7 mm. I think I bought it from Care (DruzyDesign) or maybe she added it when I bought a bracelet or earrings. Not sure exactly but if you look up the Sea of Cortez pearls that I think was in a thread or link recently it shows S of C pearls in a hand. Don't know if the hand is male or female but 2 pearls of the smaller pearls would fit across the ring finger. That is not much bigger than 6 mm, maybe 7 mm.
I wonder what is the smallest size bead they insert into the mollusk. Wish one of the Sea of Cortez experts was around. They would know at a glance. Still it is a pretty pearl.
But you could well be right. I am not to keen on the setting myself. Maybe I will invest in a really beautiful single Cortez pearl soon, again.
I do have a pair of earrings (from Care) naturally.
Thanks, Bodecia (an optimist)