COSCUEZ, Colombia/TORONTO (Reuters) - A tiny company is trying to breathe new life into a fabled, four-century-old Colombian emerald mine without triggering unrest among wary locals who fear being ...

The London-listed company already mines emeralds in Zambia and rubies in Mozambique, making it the world’s largest coloured gemstone producer. The new assets include 70% of the Coscuez emerald mine ...