Podcast
Questions and Answers
What percentage of Colombia's emerald reserves are estimated to have been mined according to government geological surveys?
What percentage of Colombia's emerald reserves are estimated to have been mined according to government geological surveys?
- 80 percent
- 20 percent (correct)
- 10 percent
- 50 percent
What are the three trace elements that influence emerald's color?
What are the three trace elements that influence emerald's color?
- Chromium, vanadium, and copper
- Chromium, vanadium, and iron (correct)
- Manganese, cobalt, and nickel
- Tin, zinc, and silver
What is the estimated percentage of the world's emerald supply produced by Zambia's Kagem mine?
What is the estimated percentage of the world's emerald supply produced by Zambia's Kagem mine?
- 30 percent
- 10 percent
- 20 percent (correct)
- 40 percent
Where are most of Brazil's facet-grade emeralds typically mined from?
Where are most of Brazil's facet-grade emeralds typically mined from?
What is typically done to emerald fractures?
What is typically done to emerald fractures?
What is the general attitude of the trade towards the presence of eye-visible inclusions in emeralds?
What is the general attitude of the trade towards the presence of eye-visible inclusions in emeralds?
Where are most of the lower-quality emerald roughs from Colombia and Brazil sent for cutting?
Where are most of the lower-quality emerald roughs from Colombia and Brazil sent for cutting?
What is the most desirable color range for emeralds?
What is the most desirable color range for emeralds?
Why should a source name not be used to describe an emerald's origin unless certain?
Why should a source name not be used to describe an emerald's origin unless certain?
Who is the global leader for cutting Zambia emeralds?
Who is the global leader for cutting Zambia emeralds?
When it comes to the number one supplier of Emeralds to the US .....?
When it comes to the number one supplier of Emeralds to the US .....?
Who is the number one exporter of emeralds to the US in terms of per carat price?
Who is the number one exporter of emeralds to the US in terms of per carat price?
What is the best way to clean an emerald?
What is the best way to clean an emerald?
Emerald is typically mined from.....?
Emerald is typically mined from.....?
The mechanized mining of Emeralds by private companies began ...?
The mechanized mining of Emeralds by private companies began ...?
The trade considers what gem to be the finest green among all colored stones?
The trade considers what gem to be the finest green among all colored stones?
Slight difference in what , make a great difference in a emeralds value when all other factors are equal?
Slight difference in what , make a great difference in a emeralds value when all other factors are equal?
What is the mining process in Columbia for emeralds?
What is the mining process in Columbia for emeralds?
Inclusions in emeralds that are highly visible and reduce transparency ......
Inclusions in emeralds that are highly visible and reduce transparency ......
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Study Notes
Emerald Characteristics
- The finest green among colored stones is considered to be that of emerald.
- The most desirable emerald colors are bluish green to green, with strong to vivid saturation and medium to medium-dark tone.
- Slight differences in hue, tone, and saturation can greatly impact emerald value.
Emerald Mining
- Modern mechanized mining of emerald in Colombia began in 1977.
- Blasting is used to extend mine tunnels, while hand picks are used to carefully remove emeralds.
- Government geological surveys suggest that only 20 percent of Colombia's emerald reserves have been mined.
Emerald Sources
- Most facet-grade emerald mined in Brazil is from the Itabira, Nova Era, and Capoeirana areas.
- Zambia's Kagem mine produces an estimated 20 percent of the world's emerald supply.
Emerald Inclusions and Cutting
- The trade generally accepts the presence of eye-visible inclusions in emeralds.
- Inclusions that reduce transparency or are highly visible can have a strong negative impact on emerald value.
- Jaipur, India, is the global leader in the cutting of Zambian emeralds.
- Colombia and Brazil cut most of their better-quality emerald rough and send the lower-quality material to Jaipur, India.
Emerald Treatment
- Emerald's fractures are often filled with oil or resin or a mixture of both.
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