Vintage 14k 70s 14K charm 2.7g diamond duo yellow gold Nugget pendant late 70s vintage authentic

Unworn in decades, from stashed collection drawer full of boxed jewelry...Portland Oregon owner vintage late 1970s purchase at Portland boutique jeweler…diamonds added early 80s Measures: about an 1” tall, unpolished & never cleaned. Sister bought nugget from jeweler within a year added two diamonds from solitaire rings from 1975.