The heart key measures 6mm wide by 18mm long. Comes with a curb cut diamond chain measuring 50cm and finished with a bolt clasp. Sterling silver, hallmarked & stamped with SR with 24 carat yellow gold plate This fine jewellery item is custom made for you; production in Australia by master craftsmen ensures premium quality. Beautiful gift packaging included. Free shipping worldwide. Valuation certificate included for items of AUD500 or more. Lifetime warranty