Personally, I am extremely dubious of the benefits of wearing any mineral.  
However, hematite is not the same stone as bloodstone.  Bloodstone is green 
jasper with bright spots of iron oxide and very pretty.  Hematite is pure iron 
oxide,   Fe2O3.   

So perhaps bloodstone could be confused with hematite since it does seem to 
have tiny spots of iron oxide in it?

Now if you're talking about magnets and magnet therapy, I used to be totally in 
disbelief that it could do a thing.   Nowadays, I'm open to the possibility 
that it may be helpful in circulation, and maybe in other things.   I just 
don't know, would be nice though.