Professional Gem Sciences

Laboratory, Ltd.

​5 S. Wabash Avenue, Suite 315​

Chicago, IL 60603

   

© Copyright 2019  PGSL

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Recent News

 

 New Course Dates Announced

for 2019

 

 Diamonds 200:   June 2, 3, 9, 10

 Gemstones 200: June 16, 17, 23, 24

New Sessions

 Diamonds 200: July 14, 15, 21, 22 

 Gemstones 200: July 28, 29, August 4, 5 


PGSL Seminar at National Pawnbrokers Association Annual Convention to Focus on Synthetic Diamonds

 

Las Vegas, NV:

Myriam Tashey will bring an exciting and informative program to this year's National Pawnbrokers' Association convention in Las Vegas. Her talk will hinge on the market for lab-grown diamonds and the best methods for detecting them. There is much speculation and apprehension about the growing market for synthetic diamonds in our industry. Her presentation will cut through the noise and present the facts. It will also be very practical, as this hands-on talk will incorporate many samples of lab-grown diamonds to illustrate techniques for detection in an everyday, real world setting.

This event will be the second appearance Myriam has made to the conference. Her last seminars were in 2017 when she, along with Eitan Tashey, spoke to the group about gemstone enhancements. The topic was very well received and we are thrill to be invited back in 2019. 

​Republication of The World of Color 

 

After years of development, Gemworld International, in collaboration with Tom Tashey, have released this new color communication system, based on Munsell. There are over 1,600 printed colors in this master comparison book of colors. Each of 40 pages has its own unique overlay chart, developed by color scientists and adapted for use in the jewelry industry by our own team of experts.

 

The system comes with a colorless faceted synthetic quartz crown. When placed over a color coordinate this gives a 3-D appearance to the two dimensional colors on the charts making comparisons more effective. Cost of shipping is for two (2) books - The World of Color and its companion book explaining how to properly use the system.

 

Get you copy today!

Publications

 

This article by Tom Tashey was featured in the Summer 2009 edition of 'Gems & Gemology.' It offers some opinions on the GIA techniques for grading D to Z diamonds and encourages some critiques of methodology for the purposes of consistency in the industry. 

This article looks at some odd laser drill techniques that were performed on a diamond which came into the laboratory recently for certification. The method detailed in the article illustrates the importance of employing great vigilance when examining any stone.

In this issue, laboratory policy to fluorescence and proper terminology are discussed at length by both PGSL and GIA lead gemologists. This issue also features a write-up on Oregon Sunstone and takes a look at Synthetic Diamonds.

In this edition, PGSL takes an in-depth look at the inclusions that are characteristic to Kashmir Sapphires. Knowing these telltale features is key to conducting origin examinations. The "Lab Notes" section takes a look at Synthetic Ruby.

PGSL Journal, Vol. 2 No. 1

This issue looks at Synthetic Moissanite and surface-enhanced topaz. A PGSL gemologist weighs in with his thoughts on laser inscribing of diamonds.

This volume explore the importance of disclosing treatment and enhancement within the jewelry industry. Another report peers into the fascinating world of chameleon diamonds, better known as color-change diamonds.

Gemstones and diamonds have a lot in common, but the clarity grading scale should not be something they share says Tom Tashey. This op-ed piece explores the usage of other laboratory terminology toward gemstones and explains why.