Effect of grease on a diamond

[Ellen]

Date: 12/16/2007 6:47:13 PM
Author: denverappraiser

Date: 12/16/2007 6:41:17 PM
Author: Garry H (Cut Nut)
I am surely ...

Ah ha.

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

Sticking to the topic.

 

[risingsun]

Date: 12/16/2007 4:29:49 PM
Author: Ellen
Weirdos.

What's even weirder...my husband, the engineer, understood everything Wink and Neil were talking about

Then he insisted on explaining it to me

I am zipping my lip now!

 

[Ellen]

 

[Garry H (Cut Nut)]

thanks Ellen

In case the surly surely's did not get the link
https://www.pricescope.com/community/threads/hca-shallow-proportions-and-the-effects-of-dirt.26140/

 

[Ellen]

You''re welcome.



surely they''d figure it out

 

[strmrdr]

Date: 12/16/2007 8:31:51 PM
Author: Garry H (Cut Nut)

thanks Ellen

In case the surly surely''s did not get the link
https://www.pricescope.com/community/threads/hca-shallow-proportions-and-the-effects-of-dirt.26140/

The next step is too get 10 shallow/deep sets and give em too pricescopers and have them report back? Right? Your buying??
After all it is Christmas!

 

[MrYoung]

Thank you all for some great responses. Im studying for the ASA MGA test in vegas and believe it or not, this is one of the questions.

Almost every diamond I see has to be cleaned before grading. Diamonds are notorious for being attracted to grease. In fact, a grease belt is used in the mining process to remove them from ore.

If diamonds are always seen like this, it would seem logical that a diamond that is cut for human grease application would be a desireable trait. I wonder if this was a consideration with the new cut grade systems?

Does anyone know the refractive index of human grease? Now thats applied gemology!

 

[golden]

wrong post

 

[Garry H (Cut Nut)]

Date: 12/16/2007 11:00:32 PM
Author: MrYoung
Thank you all for some great responses. Im studying for the ASA MGA test in vegas and believe it or not, this is one of the questions.

Almost every diamond I see has to be cleaned before grading. Diamonds are notorious for being attracted to grease. In fact, a grease belt is used in the mining process to remove them from ore.

If diamonds are always seen like this, it would seem logical that a diamond that is cut for human grease application would be a desireable trait. I wonder if this was a consideration with the new cut grade systems?

Does anyone know the refractive index of human grease? Now thats applied gemology!

I think the RI of common oils and gunk is around 1.5, but dont quote me quote http://en.wikipedia.org/wiki/List_of_refractive_indices

I take grease slightly into account by having the lowest C/P angle relationship in the only patented pure multi dimensional proportion based cut grading system that currently exists. Although this is by default - I used a greater viewing distance than AGS, and a monoscopic rather than stereoscopic approach (stereoscopic would have favoured slightly deeper stones, but not as deep as GIA)