Pink pearls you can find for yourself!

I was browsing for the history and origin of freshwater pearls when I recently came across this excellent article by Connor R. Sullivan.  I had no idea that there were any pearls found in North America, and was delighted to find that they are a Native American tradition.

Much to my surprise Connor explains that pink pearls can be found in the Miami River, OH.  What an exciting thought – to have a beautiful pink pearl necklace made from pearls coming from Ohio?  Apparently many other colors of pearls have also been found in that locality.

I’m interested in buying a pearl necklace for Valentine’s day but am not sure what chain length and diameter are considered “standard”.
I’ve already decided I want some pink saltwater pearls but if any of you ladies out there could give me some tips on the pearl diameter and chain length I’d be very grateful