VCA has done numerous mixed metal pieces - the Noeud ring, the 8-Flower Frivole ring with Diamonds or with Emeralds and Rubies, the Two Butterfly Pave/Pink Sapphire Ring and Earrings and Pave/Yellow Sapphire Ring and Earrings, not to mention the pink gold/white gold pieces in the Bouton d'Or line - so it wouldn't be unusual for them to do that. I don't love the mock-up, but, as with everything, I'm sure it would look much better in person.If my post about the RG/WG ring was reported and removed... did I hit the nail on the head? This two toned HP would match the ring and also the butterfly earrings.
With that said, I would be surprised if that was the HP this year, but of course I am no good at guessing.