Gem store UI Design

Hey all designers, I hope you all re doing fine in this tough time. I'm also trying to make the best out of this time.
The other day I was surfing the internet and I came across a beautiful collection of gemstones. And I wished only if there could be a store in my city which sold these eternal stones. Eventually, this led me to make a UI design for a gemstones store app.

I would love to know your thoughts about it and how I can improve myself. Thanks for reading this far.