Not in the sense you’re thinking of.

Going back to a previous answer, earth ponies and pegasus can use minor enchantments like wards placed on objects. They can’t use anything beyond what would be considered “minor” at the technical level. I’m not permitted to explain why, but it’s a physiological constraint.

Now, they could potentially use a magically-infused object, like what you’re talking about, to power a stronger enchantment, which would drain the object in question making it’s usefulness limited. What they can’t do, is directly drain the magically-infused object to spell-cast.

I repeat, there is no way for an earth or pegasus pony to use magic like a unicorn.

But regarding the magically-infused object? Those are even more closely regulated than enchantments themselves. Chances are, if you find somepony with one or trying to sell one, it’s very illegal.