You will be able to spend your Bonus Pearls once you've used the full amount of your top-up.

If you put, for example, € 200 (= 110 Pearls) onto your Bracelet, you will spend your Pearls in the following sequences:

Top-Up example = € 200 ( 110 Pearls + 4 Bonus Pearls) 
- 110 Pearls (€ 200)
- 4 Bonus Pearls (Free)