Iris: Gold Area contains 6 treasure chests in Ys Memories of Celceta.
Treasure Chest: Sun Stone
Treasure Chest: Purple Stone x10
Treasure Chest: Armageddon
Treasure Chest: Black Stone x10
Treasure Chest: Starlight Stone x10
Treasure Chest: Valkyrie Dress +3
Treasure Chest: Ragnarok
This chest is past the locked door leading to the Gold Area boss.