Leveling up your Crafting Mastery
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You have two options: 1st Grade Weapon/Armor Gemstone Material and 1st Grade Weapon/Armor Mudrock.

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It is highly recommended to craft the 1st Grade Weapon/Armor Gemstone Material to level up your crafting. because it uses Fortress Voucher and Socket Powder. This are highly expendable materials unlike the gemstones. 3000 gemstones are required for crafting weapons. So, save your gemstones as much as possible. (See the picture below)

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x3 Creator Mudrock is required for the weapon which requires 1000 gemstone each. So if you keep using your gemstones just to level up your crafting, you might end up short in crafting the Creator Mudrocks.
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However, for armors, you do not need to use Gemstones. If you have spare gemstones, you may use them to level up your Armor Crafting Mastery.
Socket Powder
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The only way to get Socket Powders is by Disassembling items via NPC Carmen in Ardeca. This will cost a tiny amount of Dil as well.
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1 Soul Stone = 5 Socket Powders. Buy 850 pieces Soul Stones via Incarnation of Helion NPC.
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Gems farmed via Karon's Firepot can be disassembled for ~220 Socket Powder per piece.