Giedi Prime, home of House Harkonnen. Volcanic wasteland, heavily industrialized, and not very pleasant.
The interior is black, which I very rarely do, as black interiors make the egg inherently more fragile so there’s more risk of breakage whilst working on it. The exterior is a low sheen (not quite dead matte) black with veining and carving accents in reds and oranges, covered with a red-orange sparkly shimmer in semigloss.
This is the second one in my little Duniverse series. You can take it home with the stand it’s sitting on for $100.