I mistakenly bought sterling silver (non-returnable) charms for a
14K yellow gold bracelet.
Mold the charms and cast them in gold.
I can recommend Metal-Craft Electro Plating here in NY.
Metal-Craft Electro Plating
234 w 30th st
New Nork, NY 10001-4901
They can do gold in several colors and as many microns thickness asyou like.
I am real fan of Red sky plating, have used them for years. Veryhappy with their results, work, ethics.
I'd chalk it up to a learning experience, and give the client whatthey wanted. The silver charms can be stored for use later, or can bemelted.
Regards Charles A.