EMERALD DESCRIPTION
Emerald (Panna)
Judging good Emerald
Origin: Emerald is found in India, Brazil, Zambia and Colombia.
The Brazilian Emeralds: The Brazilian Emeralds are comparatively lowest prices with very less clarity in the stone and in dark green colour. The range start from Rs.800 per carat to Rs.8000 per carat and according to the size of Emerald.
The Zambian Emerald: The most popular in the field of Astrology is Zambian Emerald. The prices are medium and clarity in the stone is very good. The range start from Rs.2000 to Rs.200000 per carat. This emerald has shown lot of miracles in the field of Astrology.
The Colombian Emerald: These are most expensive and rare emeralds. The prices are high and start at Rs.20000 per carat to any high price in lacs.
How Emerald gets Green Colour and basic difference in Colombian and Zambian Emerald.
Emeralds are formed when chromium, vanadium, and iron are present in the mineral beryl. The varying presence of these three elements gives emerald its range of colour. Chromium and vanadium make an intense green colour. Iron gives the stone a bluish tint.
The variation in chromium, vanadium and iron chemicals in Emerald tells story of its Origin.
Zambian Emeralds has more of Chromium Oxide 1.45%, Less Vanadium Oxide .48% and more Iron Oxide .25% whereas Colombian has less Chromium Oxide .68%, more Vanadium Oxide 1.87% and less Iron Oxide .05%. The combination of these chemicals gives Zambian and Colombian its different green colours.
QUALITY FACTORS
COLOR
The most desirable emerald colors are bluish green to pure green, with vivid color saturation.
CLARITY
In Emerald expect to see inclusions that dealers like to call an internal “jardin,” or garden.
CUT
Due to the crystal shape emeralds are commonly cut as rectangular step cuts called emerald cuts.
CARAT WEIGHT
Because its density is lower, a one-carat emerald will appear larger in size than a one-carat diamond.
OVERVIEW
About Emerald
Gem experts differ on the degree of green that makes one stone an emerald and another stone a less-expensive green beryl. Most gemologists, gemological laboratories, and colored stone dealers call a stone green beryl when its color is “too light” for it to be classified as emerald. Even among that group, however, there’s a difference of opinion about what’s considered “too light.”
Gemstone
2.97 BILLION YEARS
Age of the oldest emeralds, from South Africa.
CLEOPATRA
Pharaoh known for her passion for emeralds.
$6,578,500
2011 sales price for Elizabeth Taylor’s emerald pendant - that's $280,000 per carat.
FACTS
- Mineral: Beryl
- Chemistry: Be3Al2Si6O
- Color: Vibrant green
- Refractive index: 1.577 to 1.583
- Birefringence: 0.005 to 0.009
- Specific gravity: 2.72
- Mohs Hardness: 7.5 to 8
Treatments
There are a number of processes used to alter the color, apparent clarity, or improve the durability of gems.
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Synthetics
Some gemstones have synthetic counterparts that have essentially the same chemical, physical, and optical properties, but are grown by man in a laboratory.
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Imitations
Any gem can be imitated—sometimes by manmade materials or by natural materials chosen by man to impersonate a particular gem.
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