When you think of gold, do you typically see it in yellow? I'm sure you're familiar with other gold colors such as white, rose, green and even peach. Did you ever wonder how those colors are obtained? It's actually pretty simple. Pure .999 gold is bright yellow and is 24k. That means 24 parts out of 24 part are gold. Since 24k gold is quite soft, most jewelry gold is alloyed; other metals are added to pure gold and this gives it strength and will affect the color. Alloy metals can be silver, copper, zinc, and nickel - the amount of each alloy metal will change the color of the gold.Yellow gold - This is gold in its natural shade. How yellow a piece is will depend on its gold content. Generally, 14 karat gold has a brighter yellow than 10 karat gold; 18 karat gold has a deeper yellow than 14 karat gold, and so on.White gold - White gold has the same properties as yellow gold, but is mixed with different alloys to give it its white color. Generally, white gold is created by using a nickel or palladium alloy, zinc and copper. Sometimes, white gold is plated with an even whiter metal, such as rhodium (a rare member of the platinum family) to enhance its appearance.Rose gold - Different amount of pink can be created by varying the amounts of silver and copper in the alloy.Green gold - This alloy is created by mixing silver, copper and zinc to yellow gold. 18k green gold will be greener than 14k green gold. Peach gold - Usually peach gold is obtained by alloying the gold with just copper.I've also read alloy sheets that talk about purple gold and blue/white gold but I personally haven't seen it. A quick word on karat content. To determine the percentage of gold in any piece of jewelry, simply divide the karat content by 24 and multiply by 100. Therefore, 18kt is .750 pure (18/24 x 100) or 75 percent gold. So, 10kt and 14kt are 41.7 percent and 58.3 percent gold, respectively. It may surprise you to learn that 14k gold is only about 58% gold. When I make gold jewelry I work mostly with 22k gold, which I alloy myself in my studio. Sometimes I'll use 18k in a ring shank, but that's as low as I'll ever go in karat content. Working with 22k gold is a dream for a goldsmith. It's beautifully malleable and the bright, rich, yellow color is incomparable. Please feel free to share and/or comment on this article.