Lost Engagement Ring - huge sentimental value

I lost a white gold enagement ring on January 23rd. It has three diamonds set in a row, which are set so they are raised up from a white gold band. I'm not sure when exactly I lost it, but I was at around Dunnes Stores in the Beacon South Quarter between 8 and 9pm. Earlier I travelled on the Luas between Sir John Rogerson's Quay and Balally, so it could have slipped off my finger at any point.