Color System and Origin
The most specific feature of emerald is the verdant green, so the qualification of the green is the first and foremost factor in assessing the value. The classification of emerald usually depends on its color system and origin:
- Columbian Emerald. Columbia is the most important emerald origin in the world, once in the past, 75% of the emeralds in the international market are produced in Columbia. The 3 most important mines, which are Muzo, Chivor and Traiche, are all located in the Monntain Andes. The general feature of these mines’ emeralds are taking on fresh and clear green, some of which also have the special growth patterns.
- Russian or Siberian Emerald. They are produced mainly in the Russian Ural Mountains, featuring green with yellow, usually with more defaults, like bamboo like inclusions, the color is lighter than that of Columbian.
- Brazil Emerald. They are mainly produced in some green beryl of pegmatite, taking on from grey white to dark green, usually with fresh blue tone. The size of Brazil emerald was small in the past, but it has also produced the gems greater than 5 carats in recent 10 years, the volume of production has been increasing rapidly, being the important emerald origin in the world. Comparing with the emeralds produced in the Columbia, the difference is that, the Brazil emeralds have much more defaults.
- Zimbabwean Emerald. It is also called the Sandawana emerald. They are mainly dark green ones, but due to the many defaults, the size of the gems cut well is usually very small.
- Tanzania Emerald. The gems take on green with yellow, the high quality ones can match the beauty with that of Columbia, but most of them can only used as cabochon or carving.
- Zambian emerald is a kind of green emerald with dark blue with the color darker or greyer.
The trade classifications mentioned above are just broad rules, there are certain differences in the color systems of different countries’ emeralds. The factor that decides the emerald level also includes the gradation of the color. The best color is a kind of mid-level dark green, with little blue or light yellow color tone; the color, too light, dark or taking on grey, will affect its value. The color with a level discrepancy, the difference of the price will be up to 50%.
Default
The third factors that affects the price of emerald is the default. The emerald’s defaults are mainly the cotton wool, micro-crack and some dark color inclusions. On the precondition that other qualities are the same, the price of the default one will several times differences at most compare with that having no defaults. Generally speaking, the default discrepancy of one level, the price can different from about 25%~45%.
Cutting
The last factor that affects the emerald price is the cutting. The emerald is usually processed to the oblong emerald cut, which can reflect fully the color of the emerald. If it is cut into other shapes, special reasons are usually included, such as avoiding the crack or black inclusion and so on, so the price shall make some adjustments.
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