Sapphires give you extra advantages in the game. You can:
- Get a 3-day boost to your Gold, Iron or Food production by 25%.
- Boost the rate of your Building construction.
- Reduce the time needed to discover Lost Arts and train Units.
- Purchase Fortifications.
- Purchase additional Resources, Scrolls and even hire Units at the Black Market.
- Change your Castle's appearance on the Map by purchasing a Castle Skin.
Purchase additional Sapphires at the Bank by selecting the 'Bank' button in the top right-hand corner of the screen.