Does Anyone know how this is possible/what materials she uses?

There’s this woman on instagram who makes “3D printed jewelry” clearly she prints some kind of mold and then casts the jewelry with actual silver. I adore crafting and wanted to get into jewelry making but the bar of entry seemed really high, I just want to know if anyone knows what filament she’s using or how to achieve this? I doubt the mold she prints is the same one she uses to cast, but she IS printing the mold, and the final mold presumably doesnt have layer lines…so I would want to know how she’s able to get from Printed mold to castable mold

If anyone has any idea, much appreciated, she doesn’t really answer questions so I’m hoping maybe I’ll get some clues here?