Ruby

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Ruby on Rails, often shortened to Rails or RoR, is an open source web application framework for the Ruby programming language. Rails  gives the web developer the ability to create pages and applications that gather information from the web server, talk to or query the database, and render templates out of the box. As a result, Rails features a routing system that is independent of the web server. (Source WikiPedia)

Merriam-Webster Online Dictionary
ruby (noun)
1.
a) a precious stone that is a red corundum
b) something (as a watch bearing) made of ruby
2.
a) the dark red color of the ruby
b) something resembling a ruby in color
ruby (adjective)
of the color ruby
Ruby (Wikipedia)
This article is about the mineral or gem. For other uses, see Ruby (disambiguation).
Ruby
Ruby - Winza, Tanzania.jpg
Natural ruby crystals from Winza, Tanzania
General
CategoryMineral variety
Formula
(repeating unit)
aluminium oxide with chromium, Al2O3:Cr
Crystal symmetry(Hexagonal scalenohedral, H-M symbol: (3 2/m), Space group R3c
Identification
ColorNear colorless through pink through all shades of red to a deep crimson
Crystal habitTerminated tabular hexagonal prisms.
Crystal systemTrigonal
CleavageNo true cleavage
FractureConchoidal, splintery
TenacityBrittle
Mohs scale hardness9.0
LusterSubadamantine, vitreous, pearly (on partings)
Streakwhite
Diaphaneitytransparent, translucent
Specific gravity3.97 – 4.05
Optical propertiesUniaxial -
Refractive indexnω=1.768–1.772
nε=1.760–1.763
Birefringence0.008
PleochroismStrong: purplish-red - orangy-red
Dispersion0.018
Ultraviolet fluorescencered under longwave
References

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. Ruby is considered one of the four precious stones, together with sapphire, emerald and diamond.

Prices of rubies are primarily determined by color.The brightest and most valuable "red" called blood-red or "pigeon blood", 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. Ruby is the traditional birthstone for July and is always lighter red or pink than garnet. The world's most expensive ruby is the Sunrise Ruby.

About David Rashty

David Rashty, an entrepreneur and one of the early web pioneers, has over twenty years’ experience as a CTO and a CEO. David is the funder and CEO of CreativeMinds which focus on WordPress and Magento products.