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
Other articles related to "ruby":
... As with Python and Perl, Ruby has no specific block-comment syntax ... However, like Perl, documentation blocks can be used as block comments as they are ignored by the interpreter ...
... Ruby the Red Fairy is the first book in the Rainbow Magic series ... In this book, Rachel and Kirsty meet each other on a boat ride to Rainspell Island and find Ruby in a pot at the end of a rainbow ... Ruby tells them before she flutters them off to meet the fairy king and queen ...
... ActiveRecord, part of Ruby on Rails, open source Datamapper iBATIS, free open source. ...
... In 2008, the Ruby Roman grape debuted as a new variety of premium grapes in Japan ... The new grape was named Ruby Roman via public referendum ... The Ruby Roman has strict rules for selling each grape must be over 20g and over 18% sugar ...
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)
“Its quick silver bell beating, beating
And down the dark one ruby flare
Pulsing out red light like an artery,”
—Karl Shapiro (b. 1913)
“Thy great leaves enfold
The ancient beards, the helms of ruby and gold
Of the crowned Magi; and the king whose eyes
Saw the Pierced Hands and Rood of elder rise
In Druid vapour and make the torches dim....”
—William Butler Yeats (18651939)