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The only way to Sign your Items are to use HQ crystals while crafting your items.

High Quality Crystal Inferno Crystal Terra Crystal Torrent Crystal Cyclone Crystal Glacier Crystal Plasma Crystal Aurora Crystal Twilight Crystal

They are 200 GP from Guild Reps.

Additionally, Inferno/Terra/Cyclone crystals are now available from the wedding master NPC's for 3000 gil apiece.

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