That was a dagger of excellent craftsmanship. Although it wasn't an enchanted weapon, a considerable amount of adamantite and purple steel had been used to make it —— this made it reflect a distinctive faint purple luster under light. Weapons of such materials could not tap into Beyonder power, but if it were to be used against enchanted armors, the effect was often pretty good.
And on the handle of the dagger, Gawain found a symbol that looked like the head of a brown bear. There was also the embellishment of a garland around the symbol.