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
Category Mineral variety
Formula
(repeating unit)
aluminium oxide with chromium, Al2O3:Cr
Crystal symmetry (Hexagonal scalenohedral, H-M symbol: (3 2/m), Space group R3c
Identification
Color Near colorless through pink through all shades of red to a deep crimson
Crystal habit Terminated tabular hexagonal prisms.
Crystal system Trigonal
Cleavage No true cleavage
Fracture Conchoidal, splintery
Tenacity Brittle
Mohs scale hardness 9.0
Luster Subadamantine, vitreous, pearly (on partings)
Streak white
Diaphaneity transparent, translucent
Specific gravity 3.97 – 4.05
Optical properties Uniaxial -
Refractive index nω=1.768–1.772
nε=1.760–1.763
Birefringence 0.008
Pleochroism Strong: purplish-red - orangy-red
Dispersion 0.018
Ultraviolet fluorescence red 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.