Full Hard Wire is difficult to bend and expertly holds its shape in whatever configuration it is worked into. Hard wire can be used to make ear wires, pins, single jump rings, hook,s and clasps that will get a lot of use; because the harder the wire, the more "spring" it naturally has.
For example: the pin on a well-loved brooch will be pushed back and forth many times, therefore a harder wire will withstand more use before possible breakage.
Half Hard Wire is definitely more malleable than full hard, and it is the most popular wire temper for those who create "traditional" wire jewelry items.
This wire will beautifully hold any shape it is bent into and because it will work harden quickly, it is the perfect choice for executing prong designs.
Half hard wire forms crisp clean angles and smooth spirals and curves, and it is the preferred choice when making jump rings.
This prong ring was made in half hard gold filled wire.
Please keep in mind, that most jewelry making wire will "work harden" as it is bent and formed, making the harder tempers more difficult to work with near the end of a project.
This feature can be an advantage while making certain items that will take a lot of stress such as hooks, clasps, and pins, to name a few.
The temper of a wire may also appear to harder to work with, depending on the size or gauge of a wire. For example, bending a piece of 22-gauge half hard wire is much easier than bending a piece of 14-gauge half hard wire, because 14-gauge is larger.