Now that I know that I definitely need real diamonds as the base of my ‘Lucy-shaped’ diamonds I looked for some pre-made ‘meshes’ (shapes) that I could buy instead of making my own. Blender only comes with a brilliant cut diamond mesh. I need the variety of different cut diamonds to make my diamond shapes more interesting. I think I’ve found the meshes that I want to get.

This is me trying to do things the easy way - buying the pre-made shapes and then make my diamonds from them. The ‘Bloom’ diamond reference image I made was a combination of 3 brilliant cut diamonds all mushed together. That’s why that diamond worked. I had my answer all along!