Online Education For Gem Enthusiasts

  • 8,728 Members
  • 2,276 Articles
  • 139 Gemology Businesses
  • 153,577 Facebook fans

Become a Member

"IGS is a Godsend for me!"

- Charlie Bernheiser, IGS Member

"Thank you for the fantastic adventure!"

- John Parrot, IGS Member

Join Our Thriving Community

2,276 Articles
8,728 Members
139 Directory Listings

The world's best gem articles, published weekly.

Most Recent Articles

How to Grade Fancy Cut Diamonds

Fancy cut diamonds can have any finished shape, except round. These stones have their own grading criteria, in particular regarding proportion and symmetry.

Recutting Diamonds and Colored Gemstones

When is recutting diamonds and other gems worthwhile for a professional gemologist? Learn how to make this determination and avoid potential problems.

Proustite Value, Price, and Jewelry Information

Proustite crystals have magnificent red colors and good brilliance. Although facetable, they’re too soft for jewelry use but highly desired as collector’s gems.

How to Grade Set Gemstones

Gems in jewelry settings can’t be evaluated the same way as loose stones. These guidelines are for gemologists learning to grade set gemstones.

Searching for Diamonds Online — Save With These Tips!

Searching for diamonds online shouldn’t be so complex. Use our recommended parameters to buy the best diamond for your engagement ring — and your wallet!

Protective Gem Settings for Rings

All gemstones, from fragile opals to durable diamonds, can benefit from protective gem settings. Learn which jewelry designs are best suited for ring use.

Become a Gemology Pro

  • Certification Course
  • A listing in our business directory
  • Access to our up-to-date gemstone value guide
  • Access to premium articles on tools and techniques
Sign up for a Pro Membership
"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

The world's best online resource for gemstone appraisal

Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

View the Price Guide

Take Your Passion for Gemstones to a Whole New Level

For as low as $3/month

See Plans & Pricing