18kt yellow gold 18kt yellow gold Sleek Akoya pearl and diamond necklace from YOKO LONDON featuring pavé setting, Akoya pearl, delicate chain, logo tag and adjustable fit. 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..