Rose vermeil is a type of jewelry that combines a base of sterling silver with a thick layer of rose gold plating. To qualify as “vermeil,” the gold layer must be at least 2.5 microns thick and have a purity of at least 10 karats. In the case of rose vermeil, the gold used is typically rose gold, which contains a mix of gold, copper, and sometimes silver, giving it a warm, pinkish hue.