C. 1980 Vintage Mother-Of-Pearl and Green Glass Cameo Pin/Pendant in 18kt Yellow Gold. 18"

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.

CABLE: One of the most popular and classic of chain styles, created from interlocking oval links unvarying in size.

SPRINGRING CLASP: Invented in the early 1900s this diminutive device is highly effective. It's a hollow circular metal fastener with a spring opening. This keeps the clasp closed.

REVOLVER: A safety that conceals the point of a pin and keeps it in place with a revolving lever mechanism.

HINGED: A bale with a hinge. The hinge allows the pendant to be placed on and taken off a chain easily and without sliding. Ideal for putting pendants on chains that have large clasps.

GLASS: A delicate, translucent to transparent noncrystalline material made by fusing sand with other materials , such as soda and lime, and then cooling it quickly. Glass is used in anything from windows to drinkware. In jewelry, glass is used for ornamentation, to make doublets, and to simulate gemstones.

OVAL: An elliptical shape that resembles an egg.

CAMEO: A low relief carving where the carving is above the background layer. Usually carved in shell or stone to portray the profile of a woman.

MOTHER-OF-PEARL: Glowing with an iridescent beauty, mother-of-pearl has been showcased in jewelry designs for thousands of years. As mother-of-pearl is a natural substance, it may vary in appearance, and its distinctive shimmer lends a quiet elegance to fine jewelry.

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