I always have to get into the Chest-Menu, if I was idle for some time, to check if I received a jeweled chest by chance. It is a little bit annoying over time and could easily be solved, if the number of chests would show up, if we hover the Cursor over the Icon of the chests (the one on the left in the inventory).
It already works with the Rubys (in fact, you can see the number of rubys without hovering over the red-ruby-icon and by hovering. Show up on hovering is a little bit unnecessary at this Point for the Rubys. ^^)

Thank you!

@Tibberous: Do me a favor and hold your Mousecursor over the Icon on the left of the Words "Total Chests". (The one, which is showing 3 kinds of chests, if we are in an Event like now, as I am writing this.)
There will be a Popup, which explains the different Chests in detail. If you do the same with the Icon below, which resembles a Ruby, you will find a short explanation for Rubys AND the number of Rubys you own.

I was talking about this number and that it would be nice to have it next to the popups of the different chesttypes.

Never tell someone, that something is impossible. ;)
And try to be a little bit more polite next time. Thank you.