Pair of White Freshwater Pearls, 12-12.5 mm, on 18 karat white gold removable “Progressive Pearl” posts with 12 mm parabolic friction backs. by Ely Urbanski | May 25, 2021 Pair of White Freshwater Pearls, 12-12.5 mm, on 18 karat white gold removable "Progressive Pearl" posts with 12 mm parabolic friction backs.