When was white gold made?

At the turn of the century a relatively unknown metal called platinum was being combined with diamonds by jewelers such as Cartier and Tiffany. The style became extremely fashionable and was quickly in high demand throughout Europe and the U.S. Later after WW I, 18kt. white gold alloys were developed in the 1920's as a less expensive alternative to platinum. To meet the growing demand several different formulas based on gold-nickel-palladium, in different combinations became commercially available. During WW II, the use of platinum and nickel for non-war related applications was prohibited. As a result, palladium based white gold alloys became the only choice for consumers in the U.S. In addition to higher costs, white gold jewelry based on palladium alloys are denser and heavier than nickel based alloys. They are also not as white in color. After the war, lower cost nickel based white gold quickly reclaimed the lead as the dominant choice of the jewelry industry worldwide.