Iolite Buying Guide
Soft, violet-blue hues have made iolite a popular stone. Read about the quality factors for this trendy gem in our iolite buying guide.
2 Minute Read
Related Articles
Cordierite Value, Price, and Jewelry Information
The crystal structure of cordierite has many similarities to that of beryl; indialite, the dimorph, in fact has the same...
Read More
Iolite Value, Price, and Jewelry Information
This stone, which represents one of the few relatively available and affordable blue stone options, is rapidly gaining in popularity....
Read More
Gemstone Orientation for Beginners
Choosing the best gemstone orientation for your rough takes skill and experience. Learn what factors you should take into account...
Read More
What is Gemstone Pleochroism?
Some gems show pleochroism, two or three different colors depending on the viewing angle. Learn why this occurs and how...
Read More
Latest Articles
Hambergite Value, Price, and Jewelry Information
Although hard enough for jewelry use, rare hambergite is a gem for collectors of the unusual. Its combination of high...
Read More
Pearl Simulants: How to Spot Faux Pearls
Some faux pearls can be difficult to identify. Learn about the history and varieties of pearl simulants and how to...
Read More
Opal Buying Guide
Our opal buying guide can help you learn how opals are graded, what to avoid, and how to identify a...
Read More
Amethyst Sources Around the World: The Geological Story Behind These Purple Gemstones
Discover how amethyst forms in volcanic regions worldwide. Learn what makes Brazilian, Uruguayan, and other sources unique, and the geological...
Read More
Never Stop Learning
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
Get Gemology Insights
Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!