What is my Birthstone?
The idea of a single birthstone for each month is a modern idea with a long history, but today’s consumers can choose gems from traditional or modern…
Evaluating Gem Color: Hue, Tone, and Saturation
Accurately describing gem color is critical to determining a gemstone’s value. Learn how to grade hue, tone, and saturation and avoid some common…
Advanced Cutting Techniques For Cabochons
Leftover gemstone rough is a great material for learning to cut cabochons. Learn advanced cabbing techniques and find new inspiration for jewelry…
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 crystals…
Ruby Buying Guide
Learn essential ruby buying tips from experts. Discover how to evaluate color, clarity, cut & carat weight. Avoid synthetic stones & treatments.…
Corundum Value, Price, and Jewelry Information
Next to diamond, corundum is the hardest mineral known and is very compact and dense, with no cleavage. As a result, corundum is one of the best of…
Facet Designs For Beginners
What are the best facet designs for novice gem cutters? Find recommendations for cutting styles, books, resources, and gemstone rough here.
IGS Become Member