Welcome to the ISG Global Network, a free reference resource where everyone can join and share your love of gemstones. This global network resource is FREE for everyone, and anyone who loves gemstones is welcome to use this information to further your success. 

 Our support services are professional quality, our members come from all walks of life and every level of the industry, and we welcome you whether you are a hobbyist or professional, young or old. All who love gemstones and want to learn and share are welcome to join this mobile friendly learning and support network for gemstone lovers everywhere.

UPDATE: The International School of Gemology is now a 501(c)3 Non-Profit Education Organization dedicated to providing the reference and resources of this website free to everyone who loves gemstones.  If this site is of service to you, we ask that you help us keep it as a free reference site with your tax deductible donation.

13 April 2017: Gemology’s Anomalies 

Latest Update

See below for free information resources provided by the International School of Gemology

The ISG Global Network is now home to all ISG Archives and Articles, including editorials, research and everything published over the last several years by the ISG office. Do you have a favorite ISG article or archive you would like to access, or perhaps there is an ISG editorial that offered important insights you would like to share. The ISG Global Network is the place for you.

Below are some examples of the ISG Archives, Articles and Editorials that await you as a member of the ISG Global Network:

The ISG has utilized our world-wide network of professional gem dealers, jewelers and more to create one of the most accurate and up-to-date gemstone pricing guides you will find. Updated regularly, this important new feature is included free in the ISG Global Network and includes the most current market prices available for over 60 of the most often seen gemstones on the market.

Examples are below. Click on Resources drop down menu to access the full Gemstone Pricing Guide

Amethyst

amethyst

up to 1.00ct $2.00 per carat

1.00 – 2.00 ct. $5.00 per carat

3.00ct+ $7.00 per carat

up to 1.00ct $10.00 per carat

1.00 – 2.00 ct. $15.00 per carat

3.00ct +  22.00 per carat

up to 1.00ct $25.00 per carat

1.00 – 2.00 ct. $40.00 per carat

3.00ct + $65.00 per carat

Amazonite
amazonite

up to 1.00ct $1.00 per carat

1.00 – 2.00 ct. $2.00 per carat

3.00ct + $3.00 per carat

up to 1.00ct $2.00 per carat

1.00 – 2.00 ct. $3.00 per carat

3.00ct + $5.00 per carat

up to 1.00ct $5.00 per carat

1.00 – 2.00 ct. $10.00 per carat

3.00ct + $16.00 per carat

Ammolite
ammolite

up to 1.00ct $10.00 per carat

1.00 – 2.00 ct. $15.00 per carat

3.00ct + $20.00 per carat

up to 1.00ct $12.00 per carat

1.00 – 2.00 ct. $25.00 per carat

3.00ct+ $40.00 per carat

up to 1.00ct $35.00 per carat

1.00 – 2.00 ct. $55.00 per carat

3.00ct + $75 per carat

The ISG Gemstone Reference Library is your source for important information regarding gemstone properties, colors, market selling strategy and more for over 60 of the most often seen gemstones. We will constantly be updating, expanding and upgrading this special reference library to keep you informed of the latest information from the gemstone world.

Here are some examples below. Join us to access the full Gemstone Reference Library

The ISG Global Network offers a free, quick and easy chart system for you to estimate gemstone weights by measurement estimation. Using these tried and tested equations you can do quick evaluations of gemstone weights while on the go. Remember, the ISG Global Network is HTML5 mobile friendly so it goes where you go and is ready with important information when you need it most.

 

The ISG Global Network offers free support for all levels of the jewelry industry, including beaders and wire wrappers. Our special Beaders and Wire Wrappers section offers bead and gem identification specifically for those working with these design mediums, as well as important resource information to help you be more successful.

Whether you are a professional in the industry, a hobbyist in the industry for fun, or just getting started, we invite you to use these important resources to make whatever you love doing with gemstones a success.

Robert James FGA, GG
President, International School of Gemology