Locate Restina in the Temple of Eva in Heine.
She will offer you a quest to kill Blade Stakato, Threeder, and Garden Guard monsters in the Garden of Eva. You need to collect 5000 claws on this quest. You will be rewarded with a lot of adena and Big Black Treasure Chests.
These monsters sometimes drop Noble Enhancement Stones. Monsters in the Garden of Eva are between 81 and 85 in level.