Introduction At the start of 2006 GIA began, for the first time ever, issuing cut grades for round colorless diamonds. Evidence suggests this system, that was meant to help, could actually disadvantage many retailers and consumers. Background GIA began a computer ray tracing Cut Study in 1989. In 2001...
Simple but Ugly Oval Figure 1 shows a 4:3 oval (e.g. 8x6mm) cut using the same indexes (azimuths) as a standard round brilliant and also the same slopes for the main facets (the half-facet slopes must be modified for desired depth and proper meets). The pavilion, at the upper end, shows a trace of end-facet ...
Do diamond grading reports add value? With the implementation of new technologies current diamond polishing costs are about $35 per carat. Diamond grading reports run to $127 per carat. Does this seem a little strange to you?Today consumers enjoy a host of free rating services for wine, hotel, restaurants, B&am...
Why do we need diamond grading reports? CLICK HERE TO VIEW POST
There are two major Gems and Gemology articles relating to inclusions in Gems & Gemology, both primarily concerned with "black" diamonds. G&G Winter 1990: An Investigation of a Suite of Black Diamond Jewelry p.282-p.287 Robert C. Kammerling, Robert E. Kane, John I. Koivula, and Shane F. McClure and ...
Index Figure 1 shows the typical case where the break facets are equally-spaced around the circle (360°/16 = 22.5° apart). Their slopes are shown for the main slopes and proportions cited. They are 0.86% and 0.83% deep, respectively, for the pavilion and crown = total of 1.69%. With a girdle thickness of...
Getting Diamond Information When shopping online there are two possibilities for diamonds you find listed in the Pricescope search or in diamond searches on different vendor websites. The diamond you have found is owned and stocked by the vendor listing it. In this case that diamond will not be listed ...
Let's start at the beginning. The Rappaport Diamond Report is a trade magazine for jewelers and others in the diamond business. It's a pretty good magazine. It's available by subscription only and interested subscribers can inquire at www.diamonds.net. One of the regular features is a diamond pricing grid that is us...
Why isn’t Rapaport pricing important for consumers? CLICK HERE TO VIEW POST
In a previous article, I briefly touched the aspect of perception in our judgement of numbers. I made the case, that since most diamond professionals first gather their knowledge with round brilliants, that they automatically apply rules for rounds to fancy shapes. This is also true with numbers. In this articl...
Numbers and perception, the case of square diamond-cuts CLICK HERE TO VIEW POST
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