The Grandmaster Ursine Gear is an absolute upgrade from the Mastercrafted Ursine Gear, and it's available only in The Witcher 3: Blood and Wine through the Master Armorer, Lazare Lafargue. If you want to collect all six Grandmaster Ursine Gear diagrams in The Witcher 3: Blood and Wine, then you can find their locations here, along with their stats, set bonuses, and the crafting materials you need to make them!
Head to Flovive, where you can venture a short walk north to the Tufo Vineyard. On your way to the vineyard, look left, and you'll see a collapsed house, which is where the Bear Witcher, Junod of Belhaven, had gone to complete his contract on a Shaelmaar.
Go around the back of the house, and you'll find rubble blocking a tunnel, which you can clear with the use of Aard. As soon as you enter, you'll find a chest on the right with the following three diagrams:
Now that you have the treasure hunt quest thanks to the diagrams shown above, you can head to the Owl Eye Grottos, as marked on the map. There's a cave entrance here that you can enter, but be mindful of the Giant Centipede!
You'll find a rock wall to destroy with Aard when you follow the corner opposite the Giant Centipede, and you can continue through the cave, hugging the left path, until you find a small room with a skeleton containing the final three diagrams:
With all six diagrams now acquired, head to Lazare Lafargue at the Grandmaster Smith, which is located in Beauclair, and you can now make the rather costly process of crafting this armor when you return the diagrams to him.
Grandmaster Ursine Gear can only be crafted from Lazare Lafargue at the Grandmaster Smith in Beauclair, Toussaint:
+25% Resistance to bludgeoning damage
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