Total Carat Weight 39.0. Metal Purity 925 parts per 1000. 39 carat rough heart cut shaped colombian emerald pendant 925 with 18 necklace this is quite the alluring piece with an incredible semi faceted emerald as the center of attention. The emerald mines of Chivor, Muzo, and Coscuez provide the best quality emeralds in the world because of their characteristics of color and clarity.