Ruby, known as the ‘King of Precious Stones’, is a precious gemstone form of corundum. Rubies are mined at Jegdalek Gandamak in Kabul Province, where they occur in a Proterozoic calcite-dolomite marble bed 500 to 2,000m thick within a regionally metamorphosed marble cut by Oligocene granitic intrusions. The Jegdalek rubies range from nearly colorless to deep red and purplish red, and display strong fluorescence in ultraviolet radiation. True rubies form 15% of the production at Jegdalek, along with pink sapphires (75%) and blue sapphire (5%), the remaining 5% consists of mixed blue and red-topink corundum (Bowersox, 1990). Clean faceting quality rubies are rare, but those that are found are of excellent quality and are said to match those from the very best source of rubies in the world. Prices of rubies like other precious stones are dependent on origin, color, size, and clarity: from a low of US$100 to as much as US$15,000/ ct. The vast majority of rubies are “native cut” in their country of origin. High-value ruby rough is tightly controlled and rarely makes its way to custom cutters.