Pure gold (24kt), is not suitable for jewellery making because it is exceptionally soft. However, using alloy metals will give pure gold the stability it needs to be made into beautiful, lasting jewellery. Alloying is perfect for strengthening and creating colored gold such as white gold and rose gold.
The alloying metal compositions above are typical of those used by the jewellery industry to arrive at the colour/caratage combinations shown, but these are not the only ways to arrive at these combinations.
White gold compositions listed here are nickel free. Nickel-containing white gold alloys form a small/very small percentage of white gold alloys and generally contain other base metals such as copper and zinc.