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Minor oil vs no oil Muzo Green emeralds

icy_jade

Ideal_Rock
Joined
May 1, 2009
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4,199
Which AIGS lab? The China one or the Thailand one?

Color opinions are mostly rubbish in many labs... I’ve seen too many cornflower blue and pigeon bloods from reputable labs that look terrible to trust lab reports on color.
 

Sydneyphoenix

Rough_Rock
Joined
Apr 4, 2021
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70
Which AIGS lab? The China one or the Thailand one?

Color opinions are mostly rubbish in many labs... I’ve seen too many cornflower blue and pigeon bloods from reputable labs that look terrible to trust lab reports on color.

I was thinking Thailand one, I understand that’s the main office though they have office in China as well? Wonder if anyone used their Master Jade report, if it’s worth U$300.
 

icy_jade

Ideal_Rock
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I was thinking Thailand one, I understand that’s the main office though they have office in China as well? Wonder if anyone used their Master Jade report, if it’s worth U$300.

I heard the China one is more reliable than the Thai one. Generally I prefer other labs anyway.

For jadeite, the HK lab is the best imo. If it’s good enough for the top auction houses, it’s good enough for me.
 

T L

Super_Ideal_Rock
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23,805
You can find unoiled emeralds, but many will be so light in color, you’re sacrificing on color in order to get one. The more chromium, the more deep green color, but that comes with the caveat that chromium breaks up the crystal structure. There will be more fractures, and hence more likely to have clarity enhancement. Other locations for emerald may be more likely to have less clarity enhancement, but those locations produce lighter gems and/or gems with a higher vanadium content, that also produces green hues.

Countries that tend to produce lighter emeralds are:

Russia
Ethiopia
Zambia (well darker, but more vanadium)
Afghanistan
United States (North Carolina)

There are other South American mines that produce outside of the famed Muzo mine, like Chivor in Colombia, and Brazil, but they tend to clarity enhance. I think Ethiopian emeralds, although lighter than Muzo duck neck green, look very similar to Chivor material. Zambian is my least favorite. Russia produces some glowy clean material, but much of it, not all, is very pale. Afghani stones are pretty, similar to Ethiopian in color. I would say Zambian is my least favorite, but there may be some nice examples here and there. I have yet to see a Zambian that glows though.

However, in my opinion, there is nothing as beautiful as an old mine Muzo duck neck green. If you can find an untreated one, that is the Holy Grail of emerald quality, and be prepared to pay a hefty price. Many come up to auction from old collections or sunken treasure. Even Elizabeth Taylor’s famed Muzo emeralds had faint oil (AGL).
 
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Sydneyphoenix

Rough_Rock
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Apr 4, 2021
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Thank you for such an informative contribution. Around what percentage of Colombian emeralds come from Muzo, knowing of course that not all will have that vivid “old mine” green?
 

lambskin

Ideal_Rock
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Aug 22, 2012
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2,540
Query: If an emerald was treated with oil 20 or thirty years ago and has not been re-oiled, will the amount of oil be less on a subsequent evaluation report? Say from originally moderate to minimal or from minimal to slight? How much oil diffuses(?)out? In other words, if emeralds need to be re-oiled over time( and how is that determined?) and they are not does that effect the subsequent evaluation? I would assume that inclusions would be more apparent with less oil which would effect value as compared to the amount of oil. Also, does the amount of oil add significant weight? I’m confused.
 

Sydneyphoenix

Rough_Rock
Joined
Apr 4, 2021
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That’s a lovely ring!! I understand fine emeralds are not usually set in prongs due to risk of damage, for top-of-range Colombian no-oil heirloom stuff would halo oryellow gold bezel be more popular or appropriate?
 

T L

Super_Ideal_Rock
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That’s a lovely ring!! I understand fine emeralds are not usually set in prongs due to risk of damage, for top-of-range Colombian no-oil heirloom stuff would halo oryellow gold bezel be more popular or appropriate?

I’m not a fan of bezels unless done by the most skilled workshop.
 

T L

Super_Ideal_Rock
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Wouldn’t that put the sides of the stone more vulnerable to damage? Maybe half-bezel as a compromise...

Bezels are far more invasive a setting than prongs. Many a stone has become chipped or fractured under the stress of a bezel setting or while being set. Since emeralds have many fractures and are almost always clarity enhanced, I rather prong set with a soft metal, like 18k, but with double prongs for added security. That being said, some people have bezel set emeralds, and love them. It’s important therefore to get a highly skilled bench that specializes in not only setting colored gems, but bezels, so that it comes out okay. Bezels are also often sloppily done, which is something else you need to be wary of.

Here are examples of well done bezels vs a poorly done one. 9315C559-E2C9-484C-B38C-8F1EB3E51933.jpeg 9D416D6F-F250-4FDF-BD8F-6121929D1C8C.jpeg 229A8A3E-5B28-43C1-8365-09C6AB2F1BD3.jpeg
 
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Sydneyphoenix

Rough_Rock
Joined
Apr 4, 2021
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Bezels are far more invasive a setting than prongs. Many a stone has become chipped or fractured under the stress of a bezel setting or while being set. Since emeralds have many fractures and are almost always clarity enhanced, I rather prong set with a soft metal, like 18k, but with double prongs for added security. That being said, some people have bezel set emeralds, and love them. It’s important therefore to get a highly skilled bench that specializes in not only setting colored gems, but bezels, so that it comes out okay. Bezels are also often sloppily done, which is something else you need to be wary of.

Here are examples of well done bezels vs a poorly done one. 9315C559-E2C9-484C-B38C-8F1EB3E51933.jpeg 9D416D6F-F250-4FDF-BD8F-6121929D1C8C.jpeg 229A8A3E-5B28-43C1-8365-09C6AB2F1BD3.jpeg

That’s such a difference in workmanship! Will toss between bezel vs double-prong vs halo when I do get my “It” emerald; for now will likely go for imperial jade (possible “Elessar” design from LOTR?) or Burmese Ruby, emerald seems more expensive and rarer to find quality stuff in comparison!
 
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icy_jade

Ideal_Rock
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May 1, 2009
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That’s such a difference in workmanship! Will toss between bezel vs double-prong vs halo when I do get my “It” emerald; for now will likely go for imperial jade (possible “Elessar” design from LOTR?) or Burmese Ruby, emerald seems more expensive and rarer to find quality stuff in comparison!

Not really. The excellent imperial jadeite and Burmese rubies are not all that easy to find. Of course, plenty of vendors call their jade “imperial” and rubies as “pigeon blood”.
 

Sydneyphoenix

Rough_Rock
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Apr 4, 2021
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I guess you are correct to an extent given terms like “pigeon blood” and “imperial jade” is subjective but if a reputable lab will put its name down on a certificate supporting the description, hopefully it can’t be too far off. In sites like Leibish, looks like way more rubies certified as unheated Burmese pigeon blood rubies compared to certified no-oil intense green Colombian emeralds...
 

icy_jade

Ideal_Rock
Joined
May 1, 2009
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I guess you are correct to an extent given terms like “pigeon blood” and “imperial jade” is subjective but if a reputable lab will put its name down on a certificate supporting the description, hopefully it can’t be too far off. In sites like Leibish, looks like way more rubies certified as unheated Burmese pigeon blood rubies compared to certified no-oil intense green Colombian emeralds...

No really, some of the pigeon bloods I’ve seen are really dubious (and from reputable labs). I also started off like you thinking if it’s a reputable lab it should be fine but end of the day I trust what I see in real life more. :P2
 
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Sydneyphoenix

Rough_Rock
Joined
Apr 4, 2021
Messages
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No really, some of the pigeon bloods I’ve seen are really dubious (and from reputable labs). I also started off like you thinking if it’s a reputable lab it should be fine but end of the day I trust what I see in real life more. :P2

Hopefully I get lucky that the certificate matches the visual, given we can’t travel overseas!
 
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