Thereprobably are but if you're referring to witchcraft, most people bless their own ritual items or supplies. I think some covens might also have blessed ritual items for coven working, but if you're looking for specific ones that you can acquire or anything like that, I don't think it's possible.
As far as the many heroic tales go, throughout history you would think we would be tripping over sacred artifacts left, right, and center. Crowns that turn the wearer invisible, teeth that you plant and sprout out skeletal warriors like daisies in a field, swords that never break, hammers that call lightning, magical golden wool pelts, and the list goes on. It seems in the ancient days just about every God, hero, and kingdom had some symbolic tool or weapon that embodied their station.
However these are not actual items but instead representations and embodiments of the heroes who used them. Akin to a modern Comic book hero and his gimmic. (In fact a LOT of parallels exist between the old heroic-age stories and modern comics.)
The items represent what the hero was about. It wasn't just a tool or weapon but a summation of their personality and journey. They were as much the character of the hero as the heroes themselves. You hear 'hammer' you immediately think of Thor. You hear Lion pelt and club, you think Heracles. You hear helmet of invisibility you think Loki. Just as you hear spider-web and you think spider-man. You hear utility-belt and you think Batman.
Actual historical relics, on the other hand -do- exist. But they are few and far between. And many are lost to time or are not the sort of thing any individual might 'posess' or be able to use. And, also, I have found that more often than not these sorts of 'special' items are more known to be cursed rather than blessed, and are associated with misfortune and death.
A couple examples I can think of are;
The hope diamond: a part of the royal family jewels which has brought death and misfortune to the owner and their family. Which is why it is locked away.
The spear used to strike Christ on the cross ... a debatably 'real' relic said to bring victory to whoever possesses it. School is still out on if it exists.
Bixby's stoop chair which kills anyone who sits in it.
The Blarny Stone: kissing it is said to grant the gift of gab.
There are many other items like this. Usually tied to places by events that happened around them. Statues that bring luck in love if you grasp the breast (yes, that is a thing), Graves or trees that promise peace to a place as long as they are present and undisturbed, even animals, the body-parts of saints, and their once every-day tools get in on the act. (For example it is said that the tower of London, and by it London itself, would be destined to fall if the six resident crows ever left.)
Interesting. The hope diamond I've heard of, but not that chair until now. Makes me wonder what sort of magic he used to curse it back then, or if it was just accidental due to his execution.
I suppose school's out as far as theories go. Bixby wasn't known to practice witchcraft as far as I am aware. I think it may have come about as an un-intentionally intentional curse. He had no idea what he was doing, but somehow ended up doing it really well.
