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Idealscope rating

P: 9/3/2004 9:10:47 PM
ib40.5 Rough Rock Total Posts: 11 Last Post: 10/21/2004 Member Since: 8/30/2004	Gary and the gang, Has anyone given any thought to applying a scale to the Idealscope? i.e being able to say a particular diamond, by someone trained or "certified" (G.G., C.G., or proprietary Halloway training) rates a number or a percentage or whatever. Thanks.
Posted: 9/3/2004 9:10:47 PM

There are 10 replies to this message. There are 10 replies on this page.

P: 9/4/2004 4:31:04 AM
Garry H (Cut Nut) Ideal Rock Total Posts: 11,579 Last Post: 11/23/2009 Member Since: 8/16/2000	Great idea - but how would you rate each of these images? I would give them all excellent (10 out of 10) but they are all very different there are too many options and too many preferences. Garry Holloway FGAA DipDT HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au
Posted: 9/4/2004 4:31:04 AM

P: 9/4/2004 7:24:16 AM
valeria101 Ideal Rock Total Posts: 14,048 Last Post: 4/30/2006 Member Since: 8/29/2003	Err... reading color gamma and pattern consistency, perhaps? Looking for these two criteria, the bottom left stone will end up a bit out of the others' league. And the bottom-left piece seems either colored itself or pictured with some different color background. The resulting ranking being: bottom right, top left, top right and bottom right. From the wrong side of the screen, it appears that Isee2 does something simmilar (making up scores based or related to a controlled reflection). Ana "The greatest experts are only as good as the sum total of what they have seen." [Souren Melikian]
Posted: 9/4/2004 7:24:16 AM

P: 9/4/2004 8:04:53 AM
ib40.5 Rough Rock Total Posts: 11 Last Post: 10/21/2004 Member Since: 8/30/2004	O.K. If from the Idealscope images it can be determined that a certain diamond is a F.I.C. as opposed to a B.I.C, could we not then say a certain diamond is then a "B.I.C.:9"? Is this making a simple tool overly complicated? On another note, Is there any input on the idea of "rocking and tilting" the stone while viewing with the Idealscope, in effect changing the light source? Thanks, Ian
Posted: 9/4/2004 8:04:53 AM

P: 9/4/2004 9:01:26 AM
valeria101 Ideal Rock Total Posts: 14,048 Last Post: 4/30/2006 Member Since: 8/29/2003	---------------- On 9/4/2004 8:04:53 AM ib40.5 wrote: O.K. Is this making a simple tool overly complicated? ---------------- I would think so although why not, if it is not overly complicated for you !? Ana "The greatest experts are only as good as the sum total of what they have seen." [Souren Melikian]
Posted: 9/4/2004 9:01:26 AM

P: 9/4/2004 9:02:24 AM
Garry H (Cut Nut) Ideal Rock Total Posts: 11,579 Last Post: 11/23/2009 Member Since: 8/16/2000	Someone is going to need to make value judgements. It is not a good system. Your assessment of the images is very good IB40, but they are more valuable to make those sorts of judgements than giving a digital score. Besides what are you going to do with symmetry dviations ??? Garry Holloway FGAA DipDT HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au
Posted: 9/4/2004 9:02:24 AM

P: 9/4/2004 9:12:21 AM
valeria101 Ideal Rock Total Posts: 14,048 Last Post: 4/30/2006 Member Since: 8/29/2003	---------------- On 9/4/2004 9:02:24 AM Garry H (Cut Nut) wrote: Someone is going to need to make value judgements. It is not a good system. ---------------- Aren't there a few already made? This is an evaluation tool after all. But numbers would be more contestable than these pictures and the refference chart, so... even if it is feasible to turn a 'scope reading into some numbers (like the Bscope and Isee2 and the Gem Adviser do, for what that's worth) there does not seem to be a strong case pro, as you say. Ana "The greatest experts are only as good as the sum total of what they have seen." [Souren Melikian]
Posted: 9/4/2004 9:12:21 AM

P: 9/4/2004 10:18:35 AM
ib40.5 Rough Rock Total Posts: 11 Last Post: 10/21/2004 Member Since: 8/30/2004	I agree, that I'm making it overly complicated. Clarity grading,even color grading, can be subjective. Proportion analysis can be objective, though the combination of said proportions can produce subjective results. I feel that the IdealScope (and similar tools) fundamentally aid in forming a solid opinion of a stone. It just seems that G.G.'s or F.G.A.'s in training could benefit from using this tool. What a fabulous way to do pavilion depth, table %, and other estimations that I am too rusty to remember! Not to mention, symmetry quality using the IdealScope is apparent to the utmost novice. Many thanks, Ian.
Posted: 9/4/2004 10:18:35 AM

P: 9/4/2004 4:01:38 PM
Garry H (Cut Nut) Ideal Rock Total Posts: 11,579 Last Post: 11/23/2009 Member Since: 8/16/2000	OK kiddies Put some numbers on these Garry Holloway FGAA DipDT HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au
Posted: 9/4/2004 4:01:38 PM

P: 9/4/2004 4:45:16 PM
ib40.5 Rough Rock Total Posts: 11 Last Post: 10/21/2004 Member Since: 8/30/2004	Argh. I may not sleep this weekend. Does the second diamond, bottom row, exhibit better light return compared to the first diamond, bottom row, even though the symmetry is not as precise? If this is the case, then I think I'm getting a better grip. Also, does the intensity of the red correspond to the "efficiency" of light return? Thanks so much, Ian
Posted: 9/4/2004 4:45:16 PM

P: 9/4/2004 7:31:41 PM
Garry H (Cut Nut) Ideal Rock Total Posts: 11,579 Last Post: 11/23/2009 Member Since: 8/16/2000	The red intensity is not proportional - half the percieved intensity = 3/4 light return. A tiny bit of pink like inside the table in stone 2 top row = maybe 20% light loss compared to the stone 1 which looses 15% in the same region. You see why I have never tried to make a numeric scale - especially since all the various photographic systems people use (with or without photoshop or recylcled stock photo's) change the results for the same stone. Garry Holloway FGAA DipDT HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au
Posted: 9/4/2004 7:31:41 PM

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