Dimeritium ore is a crafting component in The Witcher 3: Wild Hunt that can be dismantled into glowing ore. It is needed to craft the following items:
Crafting Requirements 
It can be found as random loot throughout the entire game, as guaranteed loot in bandit camps, guarded treasures and treasure hunts in Toussaint, or purchased from the following merchants:
- All armorers and blacksmiths, except the one at Ardaiso Quarry
- Armors and weapons merchants in Nilfgaardian Army Group 'Center' Camp
- Merchant in the boatyard south of Refugees' Camp
- Merchant at Calveit Watchtower
- Merchant at Coast of Wrecks
- Merchant in Ursten
- Merchant by the road west of White Eagle Fort
- Merchant in the roadside camp south of Kaer Trolde
- Merchant in Kaer Trolde Harbor
- Merchant at the sawmill northeast of Rannvaig
- Merchant at the sawmill south of Sund
- Merchant at the Isolated Hut on Hindarsfjall
- Wandering merchants in Skellige
- Merchant in Mohrin Village
- Merchant in Stacheier
- Ofieri merchant at Upper Mill
Dimeritium ore can also be obtained by dismantling many swords, particularly those of dwarven and gnomish origins, the rarer ones with more unique-sounding names, as well as most superior+ level witcher gear swords and gauntlets.
Tips
Dimeritium ore is required to craft enriched dimeritium ore which is required to craft grandmaster witcher gear sets.
- Some higher tier swords contain dimeritium ingots which can be dismantled into ore. However, since dimeritium ingots are required for lower tier witcher sets, they should only be dismantled as a last resort.