Gold vermeil
Sterling silver coated with gold, where the gold layer is thicker and of higher purity than ordinary gold plating.
Vermeil versus gold plated
Gold plated jewelry can use any base metal, often brass, and the gold layer can be very thin. Vermeil always uses sterling silver as the base and a thicker gold layer, so it lasts longer and is a better choice for many people with sensitive skin. Gold filled jewelry is different again, with a much thicker layer of gold bonded to a base metal.
Describing it honestly
Because vermeil looks like solid gold, listings need to be clear about what the buyer gets. Call it gold vermeil and name the base metal. In the United States, the Federal Trade Commission guides set the 10 karat and 2.5 micron minimums. Other countries have their own rules, so check local guidance before you label products.
Rendering vermeil
New vermeil looks the same as solid gold of the same karat, so you can use the same yellow or rose gold material. The difference shows over time, as the gold wears on edges and contact points and the silver starts to show. Product images should show the piece as sold, which means a clean, even gold colour.
If you sell both solid gold and vermeil versions of a design, render them with the same environment and camera, and label the variants clearly. Customers rely on the description more than the image to know the metal, so the text must be precise.