The game could go a little faster, if any purchase available would be paid by non-gold jewels (or minimum possible amount of gold) by default. Of course, the player should still be able to change it, but there wouldn't be necessary extra clicks if they didn't want to.
There are situations where a player wants to use gold even if not necessary (like, desire to return the gold to bank to be able to make a reservation next turn), but it feels like those situations are quite few.
There are situations where a player wants to use gold even if not necessary (like, desire to return the gold to bank to be able to make a reservation next turn), but it feels like those situations are quite few.