Tanzanite Buying Guide
More than just a simulant for sapphire, tanzanite’s vivid hues have stunned the gem world. Our tanzanite buying guide can help you find a gem you'll love!
6 Minute Read
Related Articles
Tanzanite (Zoisite) Value, Price, and Jewelry Information
Tanzanite has had a rapid rise to prominence among jewelers and gem enthusiasts. Although naturally reddish brown, this transparent zoisite...
Read More
Ten Gemstones Rarer than Diamond
If you're looking for something unique for your next jewelry purchase, check out these ten gemstones rarer than diamond. How...
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
Denver Gem & Mineral Showcase 2017
With over 900 vendors and numerous geologic rarities, the 2017 Denver Gem and Mineral Showcase had plenty to see. Read...
Read More
Latest Articles
What is the Best Lap for Polishing Sapphire?
Polishing sapphire gemstones can be tough on laps. Learn the pros and cons of different laps and some techniques to...
Read More
Seven Famous Pearls and Their Histories
Cursed, perfect, or just huge, these famous pearls are fascinating. Read their history-rich tales filled with people like Kublai Khan...
Read More
Opal Stones and Gems: Value, Price, and Jewelry Information
Opals are in a class by themselves. As a species, opal is so unique it has its own descriptive vocabulary....
Read More
Seven Stunning but Delicate Engagement Ring Stones
With protective settings and special care, these seven beautiful but delicate engagement ring stones can help you make a unique...
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!