I bought the black one more than 10 years ago in Singapore. It is in 18K white gold and has pretty good luster with green and pink overtones. I wear it on and off and it is maybe about 9 to 9.5mm in off round shape. I think it was listed as Tahitian, but I am unsure. The white and golden ones were bought as South Sea pearls, set in 18K white gold and off round, about the same size as the black one. I would just like to know if they are what I bought them as. Would appreciate any help. I know the photos arent as clear and will try to take more when I can.