Silver-gilt

Silver-gilt or gilded/gilt silver, sometimes known in American English by the French term vermeil, is silver (either pure or sterling) which has been gilded with gold. Most large objects made in goldsmithing that appear to be gold are actually silver-gilt; for example most sporting trophies (including medals such as the gold medals awarded in all Olympic Games after 1912 and many crown jewels are silver-gilt objects.

Silver-gilt objects have been made since ancient times across Eurasia, using a variety of gilding techniques, and a distinctive depletion gilding technique was developed by the Incas in Pre-Columbian South America. “Overlaying” or folding or hammering on gold foil or gold leaf is mentioned in Homer’s Odyssey (Bk vi, 232), and fire-gilding with mercury dates to at least the 4th century BC, and was the most common method until the Early Modern period at least, though dangerous for the workers and often caused blindness among French artisans who refined the technique in the 18th century. Today electroplating is the most commonly used method: it involves no mercury and is therefore much safer. Keum-boo is a special Korean technique of silver-gilding, using depletion gilding. In China gilt-bronze, also known as ormolu, was more common. Reference: Wikipedia