Buying Guide


Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine
The most valued variety of beryl, emerald was once cherished by Spanish conquistadors, Inca kings, Moguls, and pharaohs. Today, fine gems come from South America, Africa and Central Asia.



Color is the most important quality factor for emerald. The most desirable emerald colors are bluish green to pure green, with vivid color saturation and tone that’s not too dark. The most-prized emeralds are highly transparent. Their color is evenly distributed, with no eye-visible color zoning.


Emeralds typically contain inclusions that are visible to the unaided eye. Eye-clean natural emeralds are especially valuable because they’re so rare. Most emeralds are treated with oil, resin, and/or polymers to reduce the appearance of inclusions and surface reaching breaks.


The most popular cut is a square or rectangular step cut called the emerald cut. This cut maximizes the shape and weight of the natural emerald crystal. Well-cut stones maximize the beauty of the emerald’s color to create a bright, lively stone.


Fashioned emeralds come in a wide range of sizes. There are emeralds in museums and private collections that weigh hundreds of carats. At the other extreme are tiny emeralds that weigh fractions of a carat. Quality-for-quality, the price of emerald can rise dramatically as the size increases.


Muzo Emeralds Colombia are the only gem producer in the world equipped to issue the iso 9000 certificate of origin and traceability in-house. This 'passport' for the stone comes complete with photographs. Muzo Emeralds Colombia use integrated it systems in the mines to track the date, place and time of extraction and the shape and weight of each crystal. The certificate also provides details of the rough and the final carved state of the emerald and indicates whether it has been treated with natural cedar oil.
The Muzo certificate is supported by certification from GemTech, SSEF, GRS, AGL, Gübelin, and other international laboratories.
Click here to read more about the Muzo certification.


Muzo Emerald Colombia, as of 2014, has 100% control of the historic and venerable Muzo mine in Boyacá Colombia. With close work with the miners and community as well as investment in mining technology the Muzo mine will be an example of modern ethical mining for all other colored stone mines, in Colombia and the world. The provenance of an emerald from Muzo mine stands at the pinnacle of refinement along with rubies from Burma, diamonds from Golconda and sapphires from Kashmir.