This is just out in G&G Briefs, written by GIA's Akira Hyatt.
Unusual Coated Bead-Cultured Freshwater Pearls
In September 2011, a strand of unusually large white baroque “pearls” was submitted to the New York laboratory for identification. The 17 pieces measured 22.43 x 17.60 x 14.17 mm to 29.46 x 19.64 x 16.50 mm. They had a noticeably unnatural color and surface appearance, but their baroque shape was typical of some freshwater cultured pearls seen in the marketplace ...