of Ruby
Source: Webster's dictionaryAll natural rubies have imperfections in them, including color impurities and inclusions of rutile needles known as "silk". Source: Internet
In April 2009 rubies were discovered near the city of Montepuez in Cabo Delgado. Source: Internet
Almost all rubies today are treated in some form, with heat treatment being the most common practice. Source: Internet
Dopants are added to some manufactured rubies so they can be identified as synthetic, but most need gemological testing to determine their origin. Source: Internet
During the late 1990s, a large supply of low-cost materials caused a sudden surge in supply of heat-treated rubies, leading to a downward pressure on ruby prices. Source: Internet
Filling the fractures inside the ruby with lead glass (or a similar material) dramatically improves the transparency of the stone, making previously unsuitable rubies fit for applications in jewelry. Source: Internet