18kt rose gold 18kt rose gold Novus freshwater pearl necklace from YOKO LONDON featuring freshwater pearls, AA quality pearls, delicate chain and lobster claw fastening. This piece comes with a certificate of authenticity.. Pearls should be the last thing that you put on in the morning and the first thing you take off at night. Avoid contact with perfumes or creams, and simply wipe with a soft cloth to clean..