C. 1980 Vintage .55 ct. t.w. Synthetic Ruby and Yellow Sapphire Ring in 10kt Yellow Gold. Size 7.5

10KT: Karat (abbreviated kt or K) is a unit that indicates the purity of gold in the metal. 10kt is 41.67% gold.

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.

SYNTHETIC RUBY: A gemstone that is created in a laboratory to mimic the actual properties of a natural ruby. Commonly known as "created ruby," it features the same rich red hue and transparent glow, but is significantly more affordable than a ruby found in nature.

OVAL: An elliptical shape that resembles an egg.

SYNTHETIC SAPPHIRE: A gemstone that is created in a laboratory to mimic the actual properties of a natural sapphire. Commonly known as "created sapphire," it features the same deep color and transparent sparkle, but is significantly more affordable than a sapphire found in nature.