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GIA Type Tone & Saturation Scale

megeve

Brilliant_Rock
Joined
Apr 29, 2008
Messages
1,328
Hi :wavey:

If a gemstone has a color description of '60', I know '6' refers to medium dark but what about the '0'?

I have looked up on the saturation scale, there is no '0' on it. It starts with a scale of 1-6! :confused:

Can someone please explain? Thank you!
 

T L

Super_Ideal_Rock
Premium
Joined
Sep 20, 2008
Messages
23,288
megeve|1312199224|2981537 said:
Hi :wavey:

If a gemstone has a color description of '60', I know '6' refers to medium dark but what about the '0'?

I have looked up on the saturation scale, there is no '0' on it. It starts with a scale of 1-6! :confused:

Can someone please explain? Thank you!
Are you referencing AGL's color, saturation, and tone scale or GIA's? They're not the same, but they are based on the same idea.
 

megeve

Brilliant_Rock
Joined
Apr 29, 2008
Messages
1,328
Hi TL

Ha, you got me there!. I was browsing Wildfishgems and have noticed that most color descriptions are given as 50, 60, 65, 70, 75 and even 80. I just took it for granted that this site is using the GIA grading color scale. For a '65', I read it as medium dark/strong saturation. But now, I am not sure anymore. Maybe you can clarify? Thanks!
 

T L

Super_Ideal_Rock
Premium
Joined
Sep 20, 2008
Messages
23,288
megeve|1312219381|2981663 said:
Hi TL

Ha, you got me there!. I was browsing Wildfishgems and have noticed that most color descriptions are given as 50, 60, 65, 70, 75 and even 80. I just took it for granted that this site is using the GIA grading color scale. For a '65', I read it as medium dark/strong saturation. But now, I am not sure anymore. Maybe you can clarify? Thanks!
If Ed isn't using a system that he denotes as AGL, or otherwise, then how are we supposed to know what it means? He should specify this on his website. I don't know if this is his own home grown system or otherwise. For example, Multicolour.com uses the GIA hue/saturation/tone grading system, so it's easy to figure out there.
 

Richard M.

Brilliant_Rock
Trade
Joined
Feb 17, 2004
Messages
1,104
megeve|1312199224|2981537 said:
Hi :wavey:

If a gemstone has a color description of '60', I know '6' refers to medium dark but what about the '0'?

I have looked up on the saturation scale, there is no '0' on it. It starts with a scale of 1-6! :confused:

Can someone please explain? Thank you!
You might find this helpful: http://www.artcutgems.com/content.php?content_id=1007

Richard M. (Rick Martin)
 

Kismet

Ideal_Rock
Joined
May 6, 2005
Messages
2,991
megeve|1312219381|2981663 said:
Hi TL

Ha, you got me there!. I was browsing Wildfishgems and have noticed that most color descriptions are given as 50, 60, 65, 70, 75 and even 80. I just took it for granted that this site is using the GIA grading color scale. For a '65', I read it as medium dark/strong saturation. But now, I am not sure anymore. Maybe you can clarify? Thanks!
He explains his system on his website. http://wildfishgems.com/grading
 

T L

Super_Ideal_Rock
Premium
Joined
Sep 20, 2008
Messages
23,288
Kismet|1312235918|2981799 said:
megeve|1312219381|2981663 said:
Hi TL

Ha, you got me there!. I was browsing Wildfishgems and have noticed that most color descriptions are given as 50, 60, 65, 70, 75 and even 80. I just took it for granted that this site is using the GIA grading color scale. For a '65', I read it as medium dark/strong saturation. But now, I am not sure anymore. Maybe you can clarify? Thanks!
He explains his system on his website. http://wildfishgems.com/grading
That's good, it looks like he uses some grading system akin to that of the AGL.
 
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