Gold sea glass is yellower than light amber sea glass. Sources for gold sea glass are depression glass, old glass insulators and glass that is made with selenium.
Manganese was once used as a clarifying agent in the production of clear early American pattern glass and other types of clear glass. World War I saw an insatiable demand for manganese which is used by the steel industry. The glass industry replaced manganese with selenium. Over a period of many years glass made with manganese turns lavender when exposed to sunlight and glass made with selenium turns a soft yellow-gold when exposed to sunlight.