Lost white gold engagement ring in the Royal College of Surgeons carpark

Have you seen or found an engagement ring! My mum has been married for 40 years and is absolutely distraught.... Monday 18th of March she was in the Royal College of Surgeons car park in Stephens Green on both the ground and fourth floor and it would appear the ring fell off her lap as she stepped out of the car! The ring is an unusual engagement ring in that it is a rectangle of 15 small white diamonds set on a white gold band. Needless to say it is of ENORMOUS sentimental value and she has never had a mishap before! Reward offered for the safe return of the ring! Any information please call 087 234 0964