Pair of 18k yellow gold earrings with Japanese Akoya round pearls

Yellow gold : Yellow 18K gold is an alloy contianing 75% of pure gold, whereas 14K gold contains only 58,5% of 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.