yellow-gold Naturally yellow, bright and beautiful, yellow gold has been admired for thousands of years. In history yellow gold has been associated with happiness, prosperity and wealth, common to many cultures throughout the world. Yellow gold is the only metal yellow in its natural state and one that will retain its lustre. Although very strong it is also the most malleable of metals meaning that a block of pure gold can be transformed into a sheet just a few hundredths of a millimetre thick. 24 carat gold is 100% pure gold and is deemed too soft for jewellery. 18 carat gold is mixed with other alloys such as palladium, copper, silver, zinc and nickel to add extra strength and durability. At Diamond Boutique we use 18 carat gold for our gold jewellery which is 75% pure gold. Your gold jewellery will come with a gold hallmark depicting 750 and is nickel safe.