Diamonds are a difficult item to buy in the best of circumstances. For most shoppers it’s one of the most expensive purchases of their lives and it’s aggravatingly necessary to rely on the advice o...
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“American Cut – The First 100 Years,” by Al Gilbertson, G.G.
Many of us know Al Gilbertson as an esteemed cutter, gemologist and innovator. Add "mythbuster" to his titles. Mr. Gilbertson has produced a gem of a book, sure to be a page-turner for enthusiasts ...
“American Cut – The First 100 Years,” by Al Gilbertson, G.G. VIEW POST
An Overview Of Common Alloys Used In Jewelry
Fine jewelry settings are created from precious metals. This article addresses some important information about gold, white gold, rhodium plating and nickel allergies, as well as covering fine dist...
Fractioning of Color by a Gem
This article shows an interesting effect of dispersion whereby color components are progressively diverted from the spectrum, as in 'fractional distillation' or 'fractional crystallization' of liqu...
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...
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...
What makes for a great client?
There are many facets to a consumer- vendor relationship that come into play when buying a diamond. My goal is to help you gain some understanding of what is involved in forming a solid working rel...
Cutting the AGS-0-Princess : the experience with the lab
Some time ago, I reported you about our experiences while cutting the first princess-cuts, in order to obtain the new AGS-0-cut-grade. Last week, we received a first batch of six stones back fro...
Cutting the AGS-0-Princess : the experience with the lab VIEW POST
Upper Halves – Counter Point
This response is written to address the article The Effect of Indexed Upper Half Facets written by Mr. Peter Yanzer. The opening paragraph of the article presents a concept that indexing top hal...
The Effects of Indexed Upper Half Facets
by Peter Yantzer, CG American Gem Society Laboratories Gemstone cutters can tilt or 'index' the upper half ( or upper girdle ) facets. This indexing produces different amounts of weig...