The real attraction, however, is Lucy Beattie's loose-stone "picture designs," made from the store's supply of 20,000 rubies, onyxes, topazes, emeralds, and diamonds, some as small as dust specks.

Consumers walking past the store could buy products anytime by using the eBay app and scanning sa QR code. However, some experts say that no matter what incentive a window display offers ...