C. 1990 Vintage Synthetic Turquoise Teardrop Earrings in 14kt Yellow Gold

14KT: Karat (abbreviated kt or K) is a unit that indicates the purity of gold in the metal. 14kt is 58.33% gold. In the United States, 14K 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.

LEVER: An earring backing with a hook-shaped insert and a hinged leverback to hold it in place.

SYNTHETIC TURQUOISE: A gemstone that is created in a laboratory to mimic the actual properties of a natural turquoise. Commonly known as "created turquoise," it features the same opacity and vibrant greenish blue hue, but is more affordable than a turquoise found in nature.

TEARDROP: An elongated pear shape, rounded at one side and pointed at the other.