What defines the quality and value of an emerald?
Carats
The weight of a cut emerald is measured in carats. 5 carats = 1 gram. All other criteria being equal, the higher the carat weight, the rarer the emerald and therefore the higher its value. The approximate appearance of a well-cut octagon-shaped emerald for a given carat weight is illustrated below.
Lapping
SHAPE AND CUT
To optimeze natural roughness, emeralds are cut and cut in a wide variety of shapes, as illustrated below.
Cute refers to the precision of teh emerald´s angles, proportions, symmetry an polish. This greatly affects the way light travels inside the emerald and how it comes out as a glow.
The Color
Color is a matter of personal preference. Emeralds vary in color depending primarily on their chromium and vanadium content. Therefore, emeralds from different countries and mines have different predominant colors. Emeralds range from bluish and yellowish hues to brown. However, a natural color will always have a higher value than an equivalent color obtained by any other process. Main countries where emeralds are mined: Afghanistan, Brazil, Colombia, India, Madagascar, Nigeria, Pakistan, Russia, South Africa, Tanzania, Zambia and Zimbabwe.
Tone and Saturation
Tone is simply the lightness or darkness of the gemstone. According to the GIA tone scale, the tone goes from 0 (white or colorless) to 10 (black). Fine emeralds tend to fall between 2 and 8. Note that darker does not mean better. The rich color is the darkest one to look for in emeralds. Look at the image below.
Hue
Hue is the basic color of the gem. Some colors are rarer than others. From the hue chart, the only two colors that are relevant when describing emeralds are green and slightly bluish green. Look at the image below.
Clarity & Inclusions
The clarity of an emerald is determined by the number, size and location of inclusions present in the stone. They reflect its fascinating geological aspects. Also internally and externally, there may be the presence of fissures, fractures and cavities that affect clarity.
* MODIFICATION
A Natural unprocessed emerald is very rare; Has a greater intrinsic value than one that subjected any following main processes:
CLARITY MODIFICATION:
In addition to cutting and polishing, emeralds are commonly modified to improve their color and clarity.
CRACK FILLING:
Cracks, wide fractures anda cavities can be filled with colorless and/or nearly colorless oil, resins or other agents to significantly improve clarity.
TINGIDO:
Berilo / Emeralds can undergo substatial color modification by filling cracks anda fractures with coloring agents. Customers are required to be informed of these changes. Ask for witten confirmation.
VALUE OF A GEMSTONE
In addition to the information on the front, the value of a gemstone is also defined by the combination of relative beauty, rarity and durability. Synthetic and imitation stones can be produced in industrial plants in any quantity and therefore are not rare and are not considered precious. As a result, they cost much less than their natural counterparts of equal characteristics.