C. 1950 Vintage Black Agate Cameo Ring in 14kt Tri-Colored Gold. Size 5.75

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.

TRI-COLORED GOLD: Gold is a precious metal which is often alloyed with other metals to increase strength and create different colors. Sometimes called "tri-tone," a tri-colored gold piece includes three colors of gold: yellow, rose, white, or gunmetal-finished gold. The purity of the metal is indicated by a unit called a "karat," with 24kt having the highest percentage of natural gold.

TEXTURED: A unique and varying finish with a tactile surface applied through various techniques, both by hand and with machinery.

AGATE: a variety of chalcedony, agate covers a rainbow spectrum of colors from black and gray to brown, pink, blue and yellow. Agate can be textured and exhibit a variegated layered stripe effect, which makes it a wonderful stone for carved cameos and beaded necklaces and bracelets.