18kt yellow gold diamond and pearl necklace from DAVID YURMAN featuring 18kt yellow gold, freshwater pearls, pavé-set diamonds and delicate chain. 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.. To ensure the shine and polish of your David Yurman piece, wash with a little non-bleach, soapy water and wipe clean with a soft cloth..