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.
Carat :
The carat (ct) is a unit of mass equal to 2 g. Carat is used for measuring the weight of gemstones.
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
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