You don't gain exp from breaking bijous. Went to exalted at 58. Only thing that gave exp were the ZG armament hand-ins and the neck upgrade.

How much exp do you get from Bijous?

All in all each bijou become worth 125rep. You can also turn in the coin set for 25 for the set and 50 for the token equaling 75 rep.

Do ZG coins give XP?

A guildie mentioned that you can powerlevel by turning in ZG coins, which made me curious. The quest is available at level 58, and gives 660 XP per turnin (source).