I'm sure this has been tried, of course it's been tried But, simply out of interest I'm wondering if anyone here knows about this process, if it's been used in any major applications. What am I thinking of ? I am thinking of making gold "set" for want of a better word, in a bubble/honeycomb structure, but of course very very fine, and then have a solid skin over the top to provide the surface finish/smoothness. Note: I'm not suggesting this is what Apple have done. I'm simply interested if people have used the process I just described to enable you to have a item of gold, which is "All Gold" and yet, have more volume of gold for the same actual quantity. The best analogy I can show in a photo would be this: If you imagine this was all gold: Has this been used?