Cabochon cut :
Means a polished dome shaped gemstone stone, without facet.
Cultured pearls :
Cultured pearls are the response of a pearl oyster to a man made tissue implant. This technique is used in Japan (Akoya pearls), in Australia, in Tahiti and China (fresh water pearl oysters).
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.