The first thing you are going to need is a mold. To me, it looks like this was cast as one piece.
It looks like it was cast with clear resin, with a little bit of colored purple resin. It’s hard to say exactly how this was done. Two possible approaches:
1. Clear resin was poured first. Colored resin was poured second. Both were allowed to mix as they wanted too.
2. Clear resin was poured throughout the entire mold. Something like alcohol ink was dotted across the top and blended in slightly.
Once the resin was demolded, it appears as though thick gold mica was applied to the outside edges.
The top piece that serves as the button for the clutch looks like it could be cast separately. It looks like it may be an opaque gold color. In that case, cast the resin with gold metallic powder. https://shop.resinobsession.com/collections/colorants/products/alumilite-metallic-powder
The only thing I cannot comment on are the black shadows. I think they may be something on the surface of the resin on the backside.