Gem Resources PLC, up 4.4% at 0.60 pence, 12-month range 0.50p-2.55p. The operator of Gravelotte, an emerald mine in South Africa, said it is "extremely pleased" with initial results from work at the ...

Colombia produces the world’s most expensive emeralds. The highest-quality stones can be worth tens of thousands of dollars per carat. Miners have fought over these treasures for centuries, but in the ...

GIA’s laboratories use advanced instrumentation and research to deliver accurate grading, identification, and origin ...