Navy blue Calvin Klein gown with rhinestones

I lost my navy blue Calvin Klein floor-length gown with rhinestones yesterday around 3pm near the food court at Columbia Center Mall in Kennewick. It's a size 6, in good condition with a removable rhinestone belt at the waist and a delicate silver zipper down the back. The dress has a soft champagne lining and a tiny snag along the hem that I can live with, but the overall fit is everything. It was a gift from my grandmother, so it has sentimental value and I’m really hoping to get it back.