18kt yellow gold polished finish 50.8 cm / 20 inch wheat chain pavé setting round brilliant-cut white diamonds charm stoppers clasp fastening Hallmarked in the United Kingdom at the London Assay Office. 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. Normal everyday use and external agents may reduce the lustre of gemstones and gold surfaces. To maintain, use specific, non-abrasive products specially meant for cleaning jewellery.