Quote Originally Posted by sharknado View Post
Wiki is your friend: https://ffxiv.consolegameswiki.com/w..._Weapons/Quest

- Umbrite is poetics
- Crystal Sand is the problematic one

The trades available for Crystal Sand are low on efficiency - either you dump A LOT of poetics or do gathering scrip (quicker than crafting if you aren't a crafter).

The quickest way to get gathering scrip would be through Oceanic Fishing. Every 2h instance-boat leaves Limsa for some fishing - it gives a lot of exp and doesn't really require gear or that much of it. After 2ish days your fisher would be >= 50 and you could unlock scrip currency with the quest https://ffxiv.consolegameswiki.com/w...rutable_Tastes

Then each oceanic fishing will reward you with scrip. On top of that you will be able to unlock Custom Delivery NPCs (mini stories, a mount), that weekly (12 deliveries per week) will accept collectible items giving exp and scrip in return. Fisher can be used on them - although you would have to google where and how to catch the collectible fish they want (and you would have to do Fisher quests, get some decent for the level gear).
For Crystal Sand I've been using a combination of Moonstones from GC turn ins and primal mats (Inferno Horn, Vortex Feather, etc) to reach the desired amount. At most it's a couple hundred thousand gil.