what is a sarin report used for and how to measure light return
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by Lorelei » February 10th, 2010, 6:05 am
Hi Stan A Sarin report is used to give detailed measurements of a diamond, particularly useful in the cases of rounded numbers such as GIA or fancy shapes to get the crown height, also to get an idea of overall cutting precision throughout the stone such as angle variances as an example. However apart from that in my opinion, many of the proportions aren't that useful to the layman unless they understand exactly the effect these many measurements have on the beauty or optics of the stone. This link goes into more detail concerning Sarin and Helium reports. Idealscope images show light leakage and ASET images show light return and light leakage, read more here. |
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Garek, every jeweler will tell you to value a diamond based on their 4 C''s, one of which is cut, and is properly differentiated by not "type" of cut, as in round, but rather, how well it is cut...and so...the usual diagram you''d see in a store shows you poorly shaped round diamonds (for example) either being too squat or too long, and therefore, not optimizing the light performance.
Most diamonds these days DO have a cert which is designed to provide many of the basic proportions that allow you to have a better understanding of how light will be more or less optimized, but as Lorelei mentioned, sometimes the Sarin report will help to either double check such a grading report from GIA, or give more valid numbers vs percentages than may sometimes be supplied by EGL. These other grading agencies will use different formulas to calculate the light return. Garry on this board uses this one, using some of the more important numbers (from crown & pavilion angle measures), AGS uses a very similar one, in either 3D or 2D, and GIA uses a pretty similar one. The point of the sarin report is to produce data that you can then either simultaneously (a Sarin report might come with its own built in, older style maybe) use to provide an evaluation about light performance, or you can apply this info after the fact. As both Lorelei & Stone pointed out as well, both IS and ASET are designed to provide more direct measures of light performance. Although Sarin, IS & ASET provide measures of light performance, all of them are by some measures interpretive of what you will actually see and like. Generally, these measures are thought to be pretty good, much better than a kick in the pants, and definitely all worth pursuing. |
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As I recall, there is an older version of the Sarin software that offered a light return analysis based solely on the proportions of the diamond, as I recall it produced a report indicating the light return and leakage of the diamond, but it was only an estimation based on the measurements and not on actual data provided by any sort of measured light through a diamond.
Devices such as the ASET, Ideal Scope, etc. are definitely going to provide more insight. But the Sarin output is extremely useful in terms of providing insight into the structure of the diamond in terms of the consistency of the measured sections and is an important part of our evaluation process... Each tool has its place.
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Todd Gray Nice Ice Ideal Cut Diamonds GemTrace Laser Inscribed Diamond Registry |
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Thanks regular guy for your input. I''ve tried using that calculator you linked to, but it never works right. It always tells me my numbers are off, tells me my depth is too deep. But I''m putting in the numbers I have so I don''t know what''s going on. I was sent a Sarin report but I''ve ready that if the machine isn''t calibrated after every diamond, measurements could be off. I''ve asked the diamond seller (union diamond) to get the idealscope and ASET reports. I''ll post them here when I do. |
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You are probably entering the %''s not the angles. Or the stone is really bad. Everyone wants a digital readout for beauty. Bo Derek got 10, but there were many people in the world who thought she was really a 7.
Garry Holloway FGAA DipDT
HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au |
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I think its a fancy shape like a Princess Tony by the sound of it, Garek what shape is this diamond please? |
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A Sarin file can be used in DiamCalc to get some ray tracing informatiuon on light return and light behavior in a diamond that has been measured. DiamCalc also supports Helium and Ogi measuring tools. The Sarin I have does have a ray tracing program built in for only round diamonds, but some sort of disagreement between Sarin and the ray tracing software vendor made them eliminate this on the newest versions. I use DiamCalc most of the time for this estimation although the eyes of experts do a reasonably good job, too.
David S. Atlas, GG(GIA) Sr Mbr(NAJA) ASG(AGA) My basket of services available to Pricescopers |
