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Dark Sapphire is a resource that spawns in the backpack of Grandmaster miners. There is no special place to mine for this, any location that yeilds ore can spawn a resource gem. Dark Sapphire, among others, is an ingredient required to craft the following items:

Assassin's Shortbow Darkglow Scimitar Icy Scimitar

Sapphire Mace True Assassin Spike Twinkling Scimitar