Arizona Guild Meeting
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When: Monday, March 19, 2018
6:30 PM
Where: North Mountain Visitors Center and Trailhead
12950 N. 7th St.
Phoenix, Arizona  85022
United States
Presenter: John Bradshaw
Contact: Sindi Schloss

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Schedule: 6:30 p.m. - Hors d'oeuvres
7:00 p.m. - 9:00 p.m. - Presentation and Hands-on
Cost: $20 - Members
$25 - Non-members
Payment: Makes checks payable to:
GIA Metro Phoenix
PO Box 26907
Phoenix, AZ, 85068


The Arizona Guild Presents John Bradshaw

The "Crossover Gems:" Rare, Exotic, and Wearable Non-Traditional Gemstones

More than 4000 mineral species have been described with only approximately 200 species that have been successfully faceted. All gems are sold to one of two markets, the jewelry market or the collector market.

Traditionally, sapphire, tourmaline, topaz, and the like are most often seen in the jewelry market, although they certainly can be collected as well. Many “rare” or “non-traditional” gemstones are of low hardness and durability and are confined to the collectors’ market. There is a segment between these two extremes that can be and are collectible, but also have sufficient hardness and durability to be used in jewelry. It is these “crossover” gems that we will explore including hard to find wholesale pricing of these gems.

About the Speaker:

John Bradshaw has a B.S. in chemistry from the University of Massachusetts-Boston and was working as an epoxy chemist when he took up faceting in 1979. A short time later, he gave up his chemists’ job to become a full time lapidary. He took additional courses in mineralogy and crystallography at Salem State College and became a gemologist, graduating from the GIA in 1983. He held the position of Curator of gemstones at the Harvard Mineralogical Museum for twenty years.

John also was one of two primary consultants utilizing his technical expertise in arranging, designing and setting up the “Gems” exhibit at Boston’s Museum of Science. Other domestic work includes consulting for the Smithsonian as well as being an expert witness in the evaluation of rough tourmaline for the U.S. Department of Justice.

He was also a member of an investment team involved in re-opening Mt. Mica in Maine (one of the oldest mines in the country). John has worked internationally as a consultant on many projects including work in Pakistan, Central African Republic and Russia. He is a member of AGTA, ICA, Gem-A, JBT, and NEJA.


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Mission Statement

The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.

American Gem Society

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