GIA Type Tone & Saturation Scale

[megeve]

Hi

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!

Can someone please explain? Thank you!

 

[T L]

Hi

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!

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]

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]

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.]

Hi

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!

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]

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]

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.