What are the benefits and challenges of offering a mobile app for online jewelry stores?

Nowadays, on the Internet, you can fall for scammers when buying various goods. If you are going to buy expensive jewelry online, you should think twice, especially if you are asked to pay for the goods in advance. I bought some jewelry here - https://www.itshot.com/jewelry/earrings/diamond/mens. The main plus for me is the quality of the goods and the fact that the parcel can be paid for when you receive it in your hands!