Copper is added to make rose gold...
Palladium or silver to make white.....
Geeky bit - 9ct white gold is made of 37.5% pure gold and 18ct is 75%. When held beside a yellow gold ring it looks white... but held beside a platinum or palladium ring, it will look more yellow.
White gold jewellery can be rhodium plated, which is silver in colour, to make your piece brilliantly white but unfortunately, this will wear off over time....
How long it lasts can depend on several things such as your job, or whether you use cleaning chemicals or abrasives, this can mean that the coating will wear to reveal the natural colour below.
As rhodium plating is a "pure white", the original piece of Jewellery will look yellow, but the metal is white gold.
If this happens to your Jewellery there are two options...
1. To have your jewellery repolished & rhodium plated
2. To have the jewellery polished back to their natural state. To remove the original plating and will allow the beauty of the warm white colour to shine through.
Basically there is no such thing as white gold....
Personally I love the natural colour of white gold, it’s warmer and can look amazing next to gemstones and diamonds. But I will always give my customer service the option to have pieces rhodium plated.....