Company Zellestyle has found an interesting use for the myriad electronic components that would otherwise go to waste each year. They make jewellry with it. Some of it even looks good.
So, I imagine this would be a good test to see whether your girlfriend really is into all this geeky gadget stuff, or if she just pretends to like it just to shut you up. Just buy her a diode necklace and see how she reacts. It wont break the bank either, as most of these pieces go between $40 and $60.