Brooch Hunt is a sidequest in Star Ocean: The Divine Force you can pick up in Royal Capital Ascendros Castle Gardens.
If you head to the left side of Royal Capital Ascendros Castle Gardens, you can find an Unwell Woman who has lost her Antique Brooch.
To find it, you need to head to Aucerius Plains.
You'll be able to find the Brooch as Green Item Drop on a small rock.
Once you've obtained it, head back to Royal Capital Ascendros Castle Gardens and speak to Crestfallen Father (in the same location as you picked up the quest) for your rewards.
Reward:
- Cryptographic Message D
- 9440 Fol
Amazon 
Discussion