Palladium is the next choice for use in white gold alloys and, apart from its high price and high melting point (1552 degrees celsius), is an ideal alloy.
Small Commercial Rhodium Plating Tank

Additions of about 10 -12% palladium to gold impart a good white colour. But palladium is an expensive metal and it is also a heavy metal. Thus jewellery in such palladium white golds will be more expensive than identical pieces in nickel whites for 2 reasons: firstly, the cost of the palladium and secondly, the impact of density - palladium white golds are denser and so such jewellery will be heavier. It is also more difficult to process as the melting temperatures are substantially higher.

Many commercial palladium white golds only contain about 6-8% palladium plus silver, zinc and copper. Some may even contain some nickel [so a palladium white gold is not necessarily nickel-free]. These may also have less than a good white colour and so may also be rhodium plated.

Palladium white golds tend to be softer and more ductile compared to nickel whites and so generally will not wear as well. However, despite its higher base cost and workshop recovery costs, making a more expensive product, the advantages of a non nickel alloy now out weigh these factors.