Burberry Navy Silk Ruffle Dress

Burberry navy silk dress, beautiful rich navy color, ruffle detail along the neckline, short cap sleeves, empire waist, button down back with a split, approximate length is 43”. Size is a US 10 and a UK 12. Lined and in great shape, there is a slight stain on the lower back near the split. It looks like a water stain, you can barely see it. I tried to capture it in a pic. Might be able to be spot treated.