GIA Video

[kenny]

I'm not sure if this has been posted before.
It is a video produced by GIA briefly introducing how they grade diamonds.

Most of you here already know much of this but may find it interesting and discover a thing or two.
I didn't know they used software to make the marks on the plots.
I thought they still used green and red pens.
Also now I know that GIA's D-Z scale ranges from colorless to both yellow and brown.
I asked that question here once and do not recall getting a clear answer.

This may be a handy introduction to point newbies to.

Also, do you experts take issue with anything in the video?

GIA Video

 

[stone-cold11]

WOW! Did you see that person pick up a diamond from the parcel with his bare hands?

 

[kenny]

Date: 12/9/2009 12:55:07 PM
Author: Stone-cold11
WOW! Did you see that person pick up a diamond from the parcel with his bare hands?

Yeah, but at EGL they use their toes.


(Sorry, couldn't resist.)

 

[clgwli]

As a non pro here I thought the video wasn''t very informative really as much as it was just a "commercial" for the GIA institute.

 

[Vancity]

Would you look at those deplorable working condtions...looks like a real sweatshop... lifting 200 milligram diamonds ALL day...there oughta be a law

 

[denverappraiser]

Date: 12/9/2009 2:28:03 PM
Author: Vancity
Would you look at those deplorable working condtions...looks like a real sweatshop... lifting 200 milligram diamonds ALL day...there oughta be a law

200.00000mg

I want one of those scales. Not only can you weigh a fingerprint with one of those puppies (see Stone-Cold's comment above), you can watch it and measure the rate as it evaporates.

Neil Beaty
GG(GIA) ICGA(AGS) NAJA
Professional Appraisals in Denver

 

[kenny]

Why pay for so many digits of accuracy when GIA reports only express weight to the hundredth of a carat, as in 2.35 carat?

 

[Garry H (Cut Nut)]

Date: 12/9/2009 2:48:10 PM
Author: kenny
Why pay for so many digits of accuracy when GIA reports only express weight to the hundredth of a carat, as in 2.35 carat?

GIA is obsessed about catching diamonds resubmitted because the owner wants to try for a better grade.
It is a part of their Horizon program.

Overall I think the video is very good - they could have shown a little more about clarity - thru the scope etc?
Interesting too that their is very lttle louping going on and a lot of scoping - I do not agree with that, but who cares about my opinion. (I am aware they do not want you to be able to identify any of the graders in case of more Certifigate bribery cases. Its hard to identify somone looking in a microscope.)

Any newbies here - I would value your opinion.

 

[kenny]

Date: 12/9/2009 3:35:43 PM
Author: Garry H (Cut Nut)

Date: 12/9/2009 2:48:10 PM

Author: kenny

Why pay for so many digits of accuracy when GIA reports only express weight to the hundredth of a carat, as in 2.35 carat?

GIA is obsessed about catching diamonds resubmitted because the owner wants to try for a better grade.

... and having as many a possible digits captured after the decimal place is a way to help identify a particular stone.

IOW it can differentiate between stones that weigh 2.35423 and a 2.35425 carats.
A less expensive scale would read 2.354 for both because it has fewer digits of accuracy.
But yeah, once you get down to 0.00001 carat the oil from your skin may start to be measurable.

Good catch Garry.

 

[unobtanium]

I am a newbie with a great deal of time spent learning on this site. The video seemed like a comercial to me, nothing that some 18 year old kid at zales couldnt have told me.

I really question the use of a scale with that type of percision. Espically since it is not reported on the cert. I would be very interested in two more decimal places on a cert if they are measuring to 8. Also, the gentlemen grading color was working so fast that I couldnt ever see the difference. I have been told that each GIA cert requires 3 or more people to evaluate each of the report grades and that they come to an average of the grading. But from this video I would not be able to summise that, is it even true? They should have at least mentioned it.

In the end, for all that GIA stands for in the most reliable cert, that video doesnt prove to me that they are doing anything differently than my local B&M can do to evaluate a stone.

 

[diagem]

Date: 12/9/2009 3:35:43 PM
Author: Garry H (Cut Nut)

Date: 12/9/2009 2:48:10 PM
Author: kenny
Why pay for so many digits of accuracy when GIA reports only express weight to the hundredth of a carat, as in 2.35 carat?

GIA is obsessed about catching diamonds resubmitted because the owner wants to try for a better grade.
It is a part of their Horizon program.
Thats why their recheck succession statistics plunged to an alltime low single digit %?
Overall I think the video is very good - they could have shown a little more about clarity - thru the scope etc?
Interesting too that their is very lttle louping going on and a lot of scoping - I do not agree with that, but who cares about my opinion. (I am aware they do not want you to be able to identify any of the graders in case of more Certifigate bribery cases. Its hard to identify somone looking in a microscope.)

Any newbies here - I would value your opinion.

I do..., as I surely dont agree with that...

You think these scopes might be 10X?

 

[kenny]

Even if those stereo microscopes were limited to 10x I believe the 2-eye-brain system will catch more than the 1-eye-brain system at the same magnification.

My opinion is based on working with stereo microscopes daily for 23 years.

 

[outatouch0]

Date: 12/9/2009 1:07:08 PM
Author: kenny

Date: 12/9/2009 12:55:07 PM

Author: Stone-cold11

WOW! Did you see that person pick up a diamond from the parcel with his bare hands?

Yeah, but at EGL they use their toes.



(Sorry, couldn''t resist.)

ROFLMAO