The gold in pure form is only yellow, but when you alloy it with another metals his color change depending on which metal join the mix, we can get different colors, the most common colors are, white, yellow and red, other colors like gray, green and blue are possible to create.

Depending on the gold alloy the properties change in different proportions some of them are harder other with more ductility for example the blue gold is really difficult to handle because is to fragile and for that reason you can’t get low caliper inside the mill with this particular color, the yellow have really good properties to work with and you can get filigree and different types of jewelry making.