18K white gold ring set with cubic zirconia, amethysts and Kunzites

White gold : White gold is an alloy of pure gold with copper, Zinc, Palladium or nickel.
Color : White diamonds color range from D (colorless, the purest white) to Z (light color). D, E and F are colorless diamonds, G, H , I and J are near colorless , K and L are faint color, M to Z have a light color.
Amethyst : Amethyst is a popular form of quartz that ranges from a bright to dark or dull purple color. Heated the color of the amethyst changes to yellow and is then called citrine.