Diamond engagment ring lost between bray dart to tara, arnotts, clearys

Please help: Lost my engagment ring - huge sentimental as well as monetary value. Took if off on a northbound dart just before Tara station about 11.45am walked around Arnotts and Cleays, up Abbey street, got return Dart southbound to Bray around 14.30. Have contacted shops etc but no-one has handed it in. Ring is diamond with a centre stone and shoulders, Vintage style on platnum. Reward €1,000.