THE GREEN FIRE
Popularly distinguished as a highly valued gemstone, Emerald is a grass green variety of the mineral Beryl. It gains green by trace amounts of chromium and sometimes Vanadium.
- Carat Weight
The term includes three main criterion: Hue (Vivid greens to yellow greens to blue greens) , Saturation and Tone. For example, the finest emerald will constitute of pure verdant green hue.
Emeralds have numerous inclusions and surface breaking fissures. The inclusions have a mossy effect and are termed as “Jardin”, a French word that means garden. Those emeralds which have no visible inclusions are considered as flawless. Sometimes, if there are too many surface breaking fissures then treatment is done to enhance apparent clarity and stability. Synthetic emeralds are identical to natural crystals and may rival them in colour and beauty.
There are some basic pointers that are considered while cutting procedures :
Rough’s depth of colour
The mistakes that are made by the cutter are:
Emerald crystal cutting is mostly a difficult procedure requiring accuracy and some related characteristics are:
A cut has to be designed in such a manner so that the fracture’s effect on the finished stone should be minimum.
As the nature of the gemstone is brittle, so , cut has to be done in accordance with protection against cutting, polish, setting and careless wear.
Colour has prime importance so cut should maximize the effect of hue, saturation and tone.
Sometimes the colour tone is more intense on the surface as compared to the beneath layers so careful cut is required.
Types Of Cuts: Prettiest of the natural uncut Emeralds fall short of our expectations as they are rough and unattractive. Some of the basic cuts for finishing the Emeralds are: Cabochon, brilliant, princess, emerald, diamond , single, square, beads and marquise cuts.
The carat weight of the Emeralds vary . For example, the fashioned ones come in wide range of sizes; the tiny ones are fraction of a carat. Popular jewellery have Emeralds varying from 0.05 to 0.25 carat and rarely weigh more than 1.50 carat.
Emerald becomes an ideal stone with the properties like toughness, durability, stability and vitreous lustre. Emerald crystals are hexagonal in nature. It’s liveliness does not fade or react badly to acid/sweat/daily washing liquids. A precautionary measure is to be careful, for it may fracture with a sharp knock.
Chemical signatures club with fluid dynamics and subtle precipitation mechanisms. Chemical formula of Emerald is Be3Al2Si6O18
In antiquity, it was mined in Egypt since 1500BC; and since 14th century in Austria and India. Colombia is the world’s largest producer i.e. more than 50% of the world’s production depending on year, source and grade.
Zambian mines are the world’s second largest producer. In fact, Emerald is sourced from countries like Colombia, Zimbabwe, Brazil, Afghanistan and Pakistan etc.
Emeralds from Sandawana, Zimbabwe, are the most rare Emeralds in the world. They have relative constant physical properties with high refractive indices and gravities. They have very high contents of chromium, sodium, magnesium, lithium and caesium.
A remarkable variety of Emeralds occur in Pakistan. They represent a classic example of schist-type beryl emerald mineralisation in which the beryl and other minerals found in acidic environment have been hydrothermally derived from granite rocks and deposited in hot schist which provide chromium to necessary colour the beryl.
These mines are located in Afghanistan.
The trace element of these mines produce is Vanadium .The inclusions found are moderate.
Iron is the trace element of the produce from this region. The inclusions are lesser and better transparency is observed.
The trace element of these mines is Chromium. There are more inclusions found.