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What do you guys make of this?

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jszweda

Shiny_Rock
Joined
Sep 17, 2005
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Hi all..

I know I haven''t posted in a while, but I figured this would be a good place to post given the variety of people on here. I just thought I would tap into the insight of everyone, and I want to keep this very generic for certain reasons.

Me and my mother recently acquired 2 colored stones from a vendor. We decided to get them appraised, and we may end up taking the vendor up on their offer of having an indepedent appraisal done for a small fee given the difficulty we''re having finding one here.

We took the stones, and we dropped them off for an appraiser to evaluate. There was a problem.

The appraiser stated that the stones were in fact the type of specimen as stated, however the variety couldn''t be determined. The appraiser had doubts that it was in fact the variety as stated, but they couldn''t say what other variety it could be. We''re very skeptical on this as I wiped my case clean that the stone came in, and it appeared to be unopened, and the stone was in the exact same place in the case as I left it before I dropped it off.

The appraiser stated that if they were in fact the variety that the stones were sold as, they would be worth significantly more than the intake value that the jeweler put on the parcel. The appraiser advised we send both stones to AGTA for testing, and pending that, they would put a price on them. However, that is quite expensive. We were not charged a dime, but we''re quite skeptical.

There is another reason why we are suspicious as there is a particular inclusion that each of these 2 stones have. As far as I know, that specific inclusion uniquely identifies that stone. So I asked someone who is a GG and an appraiser, and just happens to be a dealer of the same type of stone.

I asked them if this particular inclusion is visible within the stone either unaided or a loupe, if that was in fact enough imperical evidence to say that this stone is of this family, and it is this exact variety. The answer by that GG was that the specific inclusion I referred to is a very good indicator, and that is imperical evidence to say that it is that specific variety. They also stated that if this particular inclusion is in fact visible as described, and this appraiser stated what they did, they too would be skeptical.

I emailed GIA. I asked them if they had a picture of this particular type of inclusion within a stone of that family, and I named 3 varieties to see if it in fact existed. I wanted a visual reference to compare what I have seen to what GIA states as being the type of inclusion that I am looking for. So I had to order 2 back issues of their magazine, but they both have color illustrations of what I am looking for in different specimens of the same variety. In asking, the reference desk said that they could not find any illustrations of anything with that specific inclusion in a stone of that type in any other variety except for the one that I suspect is the variety of the 2 stones we have.

Something isn''t right with the appraiser from what I can gather. They have stated it is a natrual stone of a certain family. However, when we say it was sold as a stone of this family and variety x, they doubt variety x but can offer no other alternate explanations that satisfy the criteria for any other possibility. We think that there was a test for refractivity, but that''s it.

I am being vague as I am for a certain reason, and I am hesitant to send the stones to AGTA simply because I learned of their price model. I know of another reputable lab (not to say AGTA is not reputable) that can give me the same answer for a lot less.

I don''t have pics as I don''t have a digital camera. My phone won''t transmit images, and the camera on that phone just stinks.

Is my skepticism justified here and do you think my logic is sound at the risk of having "observer bias"?

-joe
 
With colored stones there are many many appraisers who quite honestly aren''t able to identify colored gems correctly. This is why it''s important to find an appraiser that specializes in colored stones.

Also, you said you didn''t pay for it. Why not? Someone who makes their living doing appraisals won''t give them away for free, so was this an independent appraiser? Or someone who sells gems as well?
 
If you are comfortable with giving more info, mentioning the species and varieties may help get more responses. It sounds like you are saying that a specific inclusion can denote a variety call within a species?? I am racking my brain trying to think of a case where this applies. I know certain phenomenens (ie. star, chatoancy, color-change)- (sometimes caused by certain inclusions), color differences, or chemical contents, can denote varieties. Does this variety call require any of these?
I know specific inclusions can prove certain Origin of stones making them of a higher value... But Origin is not a variety call.
 
My first thought was, "Oooh, he has demantoid garnets with horsetail inclusions!" Are they very dispersive, i.e. do they reflect a lot of colors?

What choice do you really have other than sending the stones to a reputable lab specializing in colored gemstones and getting a definitive appraisal?
 
Date: 2/29/2008 6:39:23 AM
Author: planet_jp
My first thought was, 'Oooh, he has demantoid garnets with horsetail inclusions!' Are they very dispersive, i.e. do they reflect a lot of colors?

What choice do you really have other than sending the stones to a reputable lab specializing in colored gemstones and getting a definitive appraisal?
That came idea came up in my thought process too...but Andradrite Garnet is given the variety call Demantoid, based on yellow green to green color and not on inclusions- the "horsetail" inlcusions are not nesessary to receive that variety call but they are a common characterisitic.
 
Sounds like you''re dealing with some kind of garnet. If it''s demantoid, "horsetail" inclusions are diagnostic but not conclusive identifiers. Almost none of the demantoids from Namibia have them. Like the "is it ruby or pink sapphire" question, how green does an andradite have to be to gain the demantoid variety classification? I''ve researched the question intensively and haven''t found any agreement by experts. Many stones I''d personally consider andradite, var. topazolite are marketed as demantoid.

If you''re dealing with another kind of garnet, be aware that exhaustive lab analysis is required to truly define many garnet species because the species mix together. Even experts disagree on the percentages of any given species in a garnet necessary to call it decisively one species or another.

If an answer is really important to you, send the stones to GIA for an identification report. The cost is quite reasonable and you''ll have a definitive answer.
 
I agree with all the above, esp. with the demantoid issues. The only way you''re going to settle this is with a lab report. It sounds like there is enough money at stake to make it worth doing.
 
I would probably spend the money to get a lab report.

Just a bit confusing, when I read the part about "indentifying the species, but not being able to call the variety". Demantoid is the only OTL "green" garnet. But the color part is what may be tricky to make the variety call. Supposedly it must be yellow-green to green with tone levels 2-6 and saturation level of at least 3.
 
Date: 2/28/2008 10:18:08 PM
Author: neatfreak
With colored stones there are many many appraisers who quite honestly aren''t able to identify colored gems correctly. This is why it''s important to find an appraiser that specializes in colored stones.

Also, you said you didn''t pay for it. Why not? Someone who makes their living doing appraisals won''t give them away for free, so was this an independent appraiser? Or someone who sells gems as well?
Here is what happened. Since the appraiser said that they could not specifically identifiy the exact variety, they couldn''t place an accurate value on it for retail replacement. As such, there was no charge. I have no issues paying an appraiser for their work. When they either don''t examine the stone or something as they should, then I have an issue. This appraiser is independent so far as I know.

The second GG who I spoke with in general, that''s another story. That GG sells stones, cuts rough, and they thought something was fishy based on the particulars that I told them.
 
Date: 2/28/2008 11:59:52 PM
Author: Missrocks
If you are comfortable with giving more info, mentioning the species and varieties may help get more responses. It sounds like you are saying that a specific inclusion can denote a variety call within a species?? I am racking my brain trying to think of a case where this applies. I know certain phenomenens (ie. star, chatoancy, color-change)- (sometimes caused by certain inclusions), color differences, or chemical contents, can denote varieties. Does this variety call require any of these?
I know specific inclusions can prove certain Origin of stones making them of a higher value... But Origin is not a variety call.
You are correct on so many counts here.
9.gif


In this case, I am not so concerned with the origin. Some might be, but I personally am not. There are certain things that by and in themselves suggest certain things, but in combination with this one particular other tidbit, there is another GG who told me that the inclusion I am describing is enough imperical evidence to say this stone is of this variety. As you state, origin is not a variety call. I agree completely.

I did talk to someone at the reference desk at GIA, and they told me that they do have illustrations of the specific inclusion I speak of, but there is no other variety of this particular species that they can find that posses this particular inclusion. The reason I bring this up is because if this was physically seen by the appraiser, I don''t understand why they would not be able to make the determination.

I would give more info, but I want to get some things squared away before I tell the rest of the story. If push comes to shove, the vendor has no problems having me send the item back for an independent appraisal.
 
I am curious to hear the details of the story, after you get things squared away...
 
Date: 2/29/2008 2:05:54 PM
Author: CaptAubrey
I agree with all the above, esp. with the demantoid issues. The only way you''re going to settle this is with a lab report. It sounds like there is enough money at stake to make it worth doing.
The lab report probably would settle it, but I don''t think that''s totally needed. If I am going to send it to a lab, it won''t be to AGTA. Why? I''ve seen the price schedule, and I know I can get a lot better of a deal from Gubelin to do the same thing. I also emailed AGTA for some info to clarify things pertaining to something and I asked them for their fee schedule. They have yet to reply, but I got a fee schedule from another GG.

My thinking here is this. The appraiser won''t say it is the x variety of this speices. They can''t say what else it is, and if it is in fact that, then this person should have the money to pay for this pricey lab report to verify it. In the process, I know that there is room for a markup with the lab report. I detect either a bit of ignorance on the part of the appraiser or a bit of snobbery to be blount.

The other reason I am a little hesitant to send this to a lab right now is simple. I just acquired the item very recently. It''s not just one stone-there are 2 that need to be sent in this case, so there are 2 fee''s that need to be paid. If I end up having to send it to a lab because someone can''t readily identify it fully, then so be it. It may be a few weeks or whatever, but if it comes to that, fine. I just wish I could find someone who is both local and more versed on these things.
 
Date: 2/29/2008 5:31:49 PM
Author: Missrocks
I am curious to hear the details of the story, after you get things squared away...
9.gif
When I get things squared away, I will say more.

From what I can research, and based on accepted definitions and parameters as of recent, these 2 stones fit the criteria. The vendor...I am sure many have heard of at some point or another.
1.gif
The vendor said that it is what it appears to be. I have no reason to dispute the origin, and even if it came from another locale, it would make no difference to me.

From what I can tell without any instruments besides a loupe, there are certain optical properties that are consistent with the stone that say...yes it is of this species/family. There are certain inclusions in the stone that are common with the species in this case. However, there is the presence of one particular type of inclusion that from what I can tell denotes other things that are specific to this variety only.

What is worse is that pending the lighting conditions, the inclusion I speak of on the one stone is eye visible. In either stone, these same specific inclusions are loupe visible. If someone were to see those, I don''t understand how anyone could say that they are NOT what they were sold as, and if someone were to rule that out, they can''t offer any other possibility as to the specific variety.

Let me put it this way. If I showed you a picture of the inclusions I am referring to, you or someone on here would probably figure it out really quickly. If I had a camera and decent lighting to show these things accurately, inclusion or not, I think at least a few people on here would readily recognize it for what it is.
2.gif
 
Date: 2/29/2008 2:50:27 PM
Author: Missrocks
But the color part is what may be tricky to make the variety call. Supposedly it must be yellow-green to green with tone levels 2-6 and saturation level of at least 3.

Is that a GIA color definition? If not, what''s the source? Just curious. "The Guide" says only "Green, slightly yellowish green, strongly yellowish green, yellow-green" with no specific tone or saturation numerics. Other sources vary.
 
Date: 2/29/2008 8:38:08 PM
Author: Richard M.

Date: 2/29/2008 2:50:27 PM
Author: Missrocks
But the color part is what may be tricky to make the variety call. Supposedly it must be yellow-green to green with tone levels 2-6 and saturation level of at least 3.

Is that a GIA color definition? If not, what''s the source? Just curious. ''The Guide'' says only ''Green, slightly yellowish green, strongly yellowish green, yellow-green'' with no specific tone or saturation numerics. Other sources vary.

I got that out of my Gem Reference Guide (GIA), listed under demantoid color range.
 
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