Necklace decorated with 38 white pearls

Gold : Because of the softness of pure gold, it is alloyed with silver, copper or palladium. The proportion of these other metals give yellow, white gold. Without precision, the gold used in jewelry is 18 K, corresponding to 75% pure gold.
Pearl : Pearl are naturally found in molluscum. They can also be "cultivated" which means that a nucleus has been artificially introduced into the shell in order to induce the production of a pearl by the molluscum.
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.