A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires. The ruby is considered one of the four precious stones, together with the sapphire, the emerald, and the diamond.
Prices of rubies are primarily determined by color. The brightest and most valuable "red" called pigeon blood-red, commands a large premium over other rubies of similar quality. After color follows clarity: similar to diamonds, a clear stone will command a premium, but a ruby without any needle-like rutile inclusions may indicate that the stone has been treated. Cut and carat (weight) are also an important factor in determining the price.
Read more about Ruby: Physical Properties, Natural Occurrence, Factors Affecting Value, Treatments and Enhancements, Synthetic and Imitation Rubies, Records and Famous Rubies, Historical and Cultural References
Famous quotes containing the word ruby:
“It is better to be looked over than overlooked.”
—Mae West, U.S. actor, screenwriter, and Leo McCarey. Ruby Carter (Mae West)
“A man in the house is worth two in the street.”
—Mae West, U.S. actor, screenwriter, and Leo McCarey. Ruby Carter (Mae West)
“Its quick silver bell beating, beating
And down the dark one ruby flare
Pulsing out red light like an artery,”
—Karl Shapiro (b. 1913)