Formed from aluminum and silicon with the rare element beryllium, Emeralds are a member of the Beryl family that takes its color from chromium or vanadium. Thought to possess magical properties and healing powers, Emeralds were considered to be a cure for many diseases. Also believed to heighten fertility and sexual desire in females, this may be perfect choice for your Antique Emerald Engagement Rings . Columbia is generally recognized as the source of the world's finest quality emeralds. These precious green Emeralds were being used by the Columbian Indians before 1537 when Quesada conquered Columbia , although the ‘Muzo' and ‘Cosquez' mines are the most prized in terms of most desirable Emerald color.