Gold Vermeil Crystal Tennis Bracelet Approximately 7 1/2" long. Stunning high quality luxury piece that will probably last a lifetime can be handed down the family line. Stamped 925. Silver-gilt, also known as vermeil, describes solid silver objects covered with a thin layer of gold. The gold plating must be at least 375 parts per thousand and no thicker than 2 microns. The process of applying the gold is called silver gilding or vermeiling. Silver-gilt has been used since ancient times in Europe and Asia. The Incas developed a unique depletion gilding technique, while Homer's Odyssey mentions "overlaying" or hammering gold leaf onto objects.