Colombian emerald ring, Silver 925, Real natural emerald, Size 5 Gem 0.9 Carats We only sell genuine natural emeralds directly from the Colombian mines of Chivor, Muzo, & Coscuez. The emerald mines of Chivor, Muzo, & Coscuez provide the best quality emeralds in the world because of their characteristics of color & clarity. The rarest & most expensive emeralds in the world have been discovered in these mines. Size 5, Genuine Colombian Emerald Ring, Silver 925, Real Natural Emerald, Size Carats 0.9