Manhattan Chapter of the GIA Alumni
Manhattan Chapter of the GIA Alumni




Color and Chemistry in Gemstones

presented by


Pamela Cevallos, GIA GG, MS, and Daniel Girma

From the GIA NY Gem Identification Department

Why are rubies red?  How does Alexandrite change color?  Color is a complex topic and is the most important feature for gemstones and minerals.  We will cover basic topics about color and light, and then take a look into the color causes in minerals and gemstones. There will also be a brief overview of the analytical instrumentation used to study color in gemstones. Finally, we will discuss color in some well-known gemstones in the trade.


Date: Wednesday, April 19th, 2017


Time: 5-6PM Sandwiches & Sodas
           6-8PM Lecture
Place: GIA New York Education, 50 West 47th St. (between 5th and 6th Avenues), 8th  



Cost: $25 Members only. Checks made out to: GIA-AA-NY Limited to 50.  Prepaid 

          Only!  No walk-ins!   No credit cards, please.   As a courtesy to our alumni and    

          the speaker there will be no admittance after 6 PM. If you are not on the security

          list by the RSVP date of April 12th, you cannot attend. This is 7 days before 

          the event!! All attendees must bring their government issue identification

          (driver license or passport) to pick up their access card at the building lobby

          security post area with no exception.  Please come half hour early due to

          security protocols.

RSVP: Must be in by Tuesday, April 12th, 2017 – Checks made out to: GIA-AA-NY

Payment: Send to: Gail B. Levine, G.G., P.O. Box 18, Rego Park, NY 11374        


Grateful appreciation to Laura Mathews for her generous donation at the last meeting. It contributed toward the 2017 effort for the Eunice Miles Scholarship Fund. Calendar of events and more on the Manhattan Chapter's new and improved website.



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