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GIA Gem Proportion Scope
https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=11&t=19788
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Author:  TerryB3399 [ Mon May 19, 2014 6:41 pm ]
Post subject:  GIA Gem Proportion Scope

I just got a RARE GIA GEM PROPORTION SCOPE #140, unfortunately there is a missing part the STONE HOLDER. Is there anyone here that has an extra one they would be willing to sell or is there someone that can make one for me.

TerryB

Author:  G4Lab [ Mon May 19, 2014 6:46 pm ]
Post subject:  Re: GIA Gem Proportion Scope

The stone holder is almost always missing when you buy them on ebay.

I could have one made but be prepared for sticker shock.

Author:  TerryB3399 [ Mon May 19, 2014 8:40 pm ]
Post subject:  Re: GIA Gem Proportion Scope

Are they still making them in china?

Author:  G4Lab [ Tue May 20, 2014 10:45 am ]
Post subject:  Re: GIA Gem Proportion Scope

I don't think this item was made in china.
The proportionscope certainly was not.
Hard to say what they are doing now.

They still have the diamond holder here:
http://store.gia.edu/DLScope_Reticle_p/964300.htm

Author:  TerryB3399 [ Tue May 20, 2014 3:57 pm ]
Post subject:  Re: GIA Gem Proportion Scope

thanks for the info Gene, I'll check it out

TerryB

Author:  G4Lab [ Tue May 20, 2014 4:35 pm ]
Post subject:  Re: GIA Gem Proportion Scope

I looked at the recent ebay offerings of GIA Diamond Proportion Analyzers.
There were four that had been offered. Three of them did not have the stone holder.
Also some did not have both screens. There are supposed to be two different screens.
There also were screen versions sold only to registered AGS jewelers that had AGS proportion information on them. These had the AGS logo too.

Author:  TerryB3399 [ Wed May 21, 2014 9:58 am ]
Post subject:  Re: GIA Gem Proportion Scope

Thanks for all the info. it appears Bear has a holder and is sending it as we speak. I appreciate all the help.

Terry B

Author:  Barbra Voltaire [ Wed May 21, 2014 10:45 am ]
Post subject:  Re: GIA Gem Proportion Scope

Isn't using the GIA's Facetware a better option?
http://diamondcut.gia.edu/06_estimating ... grade.html

Author:  Bill Hanneman [ Wed May 21, 2014 12:53 pm ]
Post subject:  Re: GIA Gem Proportion Scope

Barbra Voltaire wrote:
Isn't using the GIA's Facetware a better option?

No. One must acurately know the crown and pavilion angles and the total depth. The rest is all subjective.
One must have numbers in order to accurately cut grade a diamond, unless you believe the is no such a thing as "ideal cut" and then everything is subjective.

Author:  Conny Forsberg [ Tue Dec 05, 2017 7:10 am ]
Post subject:  Re: GIA Gem Proportion Scope

Anyone have a link to a proportionscope manual?

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