Jeremy, it didn't even cross my mind that it'd be a different type of pearl, I just thought it may have been dyed. I feel sorry for both the goldsmith and the customer (although they will probably never find out). It's a reputable goldsmith, so I believe that it'd be an honest mistake on her part. She may have been duped from wherever she puys her pearls.
Katbran, yes it is quite cool isn't it? I like this goldsmith's work, her designs are great.