Agate Buying Guide
Decorative, patterned forms of agate are excellent natural gems. Learn more about agate's mesmerizing patterns in our agate buying guide.
2 Minute Read
Related Articles
Chalcedony Value, Price, and Jewelry Information
Technically, chalcedony (kal SED' uh nee) is any form of microcrystalline or cryptocrystalline quartz, (meaning any form of quartz whose...
Read More
Agate Value, Price, and Jewelry Information
Agate is a variety of chalcedony that exists in many colors and is often commercially dyed. Agate is distinguished by...
Read More
What is the Average Gemstone Faceting Yield?
What’s the average gemstone faceting yield from a single piece of rough? Learn how to estimate how much material you’ll...
Read More
Unique Gem Materials for Jewelry Design
Some gems have an appeal beyond their appearance. If you’re looking for a gem with a story to tell, try...
Read More
Latest Articles
Celebrity Engagement Rings
What stones are the trendsetters using to pop the question? Take a look at the diamonds and colored gems in...
Read More
Ruby and Sapphire Grading Tools
What ruby and sapphire grading tools does a novice gemologist need? Learn how basic gemological equipment can help you identify...
Read More
Cerussite Value, Price, and Jewelry Information
As beautiful as a diamond, a faceted cerussite actually has higher dispersion and usually excellent transparency, colorless or light body...
Read More
Ouro Verde Quartz: History and Treatment
Ouro Verde quartz, also known as lemon quartz, is a popular treated stone. Learn how experiments with other gems led...
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!