Labs grading mistakes are a diamantaires favorite topic of conversation; are mistakes myths or reality? We aim to find out. If major labs give the same diamond 2 or more grade differences, this ...
Search Results for: Diamonds
Making the case for Imagem diamond grading
When one looks for solutions to problems it is best to look for the simplest possible one. There may be more than one legitimate way to solve a problem or to accomplish a task, but the simplest met...
GIA Excellent Cut Grade: Case Study
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 d...
Why do we need diamond grading reports?
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 t...
Scallops
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. The...
Why isn’t Rapaport pricing important for consumers?
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 ...
Why isn’t Rapaport pricing important for consumers? VIEW POST
Numbers and perception, the case of square diamond-cuts
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 brillia...
Numbers and perception, the case of square diamond-cuts VIEW POST
USA Adventures June 2005
Vegas JCK Trade Fair My wife Drena left a week before me (with Vanessa) and visited some of our joint suppliers in ArezzoItaly, 100km south of Florence. Most unfair that she gets to go and...
The diamond industry in 2005 – halfway review
July 29th today. About half a year ago, I wrote an article looking ahead at events and trends in the diamond industry during this year. Today, the Antwerp diamond business closes for their Summer h...
Jewelry in Renaissant Art
Introduction As one explores art galleries of Rome and of Florence, it is difficult to not become immersed in the literally brilliant use of jewelry in Italian Renaissant pai...