Hey, recently I have put some effort into making a Gem Purchasing UI for my game and here is how it looks so far:
My main issue right now is trying to find free vector graphics to fill the slots (for example: Pile of Gems, Chest of Gems, ect.) and also want some feedback on the UI and how I can improve it so it will look nicer in game.
Thanks in advance. 
it looks perfect imo
you could rotate the “best deal” text to make it look nicer
This is a wonderful gems UI, but there are a few things that I would recommend changing, the first one is the best deal purchase background, I would suggest making the background slightly orange so that it looks a but more aesthetically pleasing considering its a discount. And the second thing is the close UI button, I think that you could make the ‘X’ slightly smaller.
Nice small little UI. Only things I would recommend is shrinking thes size of the “X” Button, rotating “Best Deal!”, and to find better vectors, use this site: https://www.flaticon.com/
So yeah basically what everyone else said. You also might want to align the boxes perfectly, if you can see, the 600 Robux one goes a bit farther down than the 2,400. Not a big deal but just a thought!
To be honest. It’s perfect. that’s an amazing hard work right here. Good job 
Looks amazing! Perfect!
Keep up the good work dude! 
Thanks for all the feedback! Here is an update:
Nice job man! Looks super clean! GG
I love it! I was originally going to say the prices were too high but you changed them to fair prices. I like it very much and I hope you the best with your game!
That’s looking great! However, I think the close icon and button looks way to big if you look at the size on the other elements in the User Interface. Aside from that, it’s great!