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.
Onyx :
Onyx is a (banded) variety of chalcedony. The colors of its bands range from white to almost every color. Ony is used to carve Cameos