Ruby

A ruby is a pale pink to dark red color. Rubies are a mineral corundum. The red color is caused mostly by the occurance of chromium.Ruber latin for red is where rubies got their name. The corundum (aluminium oxide). ruby is considered one of the four precious stones, together with the sapphire, the emerald, and the diamond.[1]
Ruby prices are primarily determined by color. Most valuble and brightest "red" commands a huge premium over other rubies of similar quality. Clarity follows color: 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. 
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References ==
http://en.wikipedia.org/wiki/Ruby
picture from wikipedia
Category:Not Related to Almandine 2018
Category:Almandine 2018