Boyaca – A state in Colombia that is home to the two main emerald producing areas of Colombia.
Cedar oil – Natural oil from Cedar trees that is the traditional treatment for Colombian emeralds.
Chivor – A mining area for Colombian emeralds in the Eastern Andes.
Cut – The shape in which the emerald is fashioned.
Facet – The small polished surfaces of a cut gem
Fine/Extra fine – Used to describe stones of the very highest quality.
“Inclusion” or “jardin” – Terms used to describe impurities in the host stone.
Muzo – The main mining area for Colombian emeralds, located in Boyaca.
No oil – A stone with no treatment applied.
Refractive index – When used context of gemstones this is the dimensionless number that articulates how light propagates through the stone.
Resin – A non-natural substance used to treat emeralds.
Rough – An emerald in its unpolished natural state.