C. 1970 Vintage Red Coral and 18kt Yellow Gold Square Earrings

18KT: Karat (abbreviated kt or K) is a unit that indicates the purity of gold in the metal. 18kt is 75% gold. In Europe, 18K yellow gold is most favored and used in jewelry.

YELLOW GOLD: Gold is a precious metal with a natural yellow color. It is quite soft and often alloyed with other metals to increase its strength. The purity of the metal is indicated by a unit called a "karat," with 24kt having the highest percentage of natural gold.

CLIP/POST: An earring with a post insert and a clip mechanism to hold it in place. The post can be removed by a jeweler to convert the earrings to clip-on.

CORAL: This prized sea stone conjures up images of exotic oceans and faraway places. With shades ranging from soft muted pinks to vibrant bold reds, coral jewelry complements every skin complexion with a warm glow.

SQUARE: A symmetrical shape with four equal sides.

CARVED: When a gemstone is cut so that the outline or surface takes the form or likeness of a specific image or pattern.