Polariscope Guide, Part 3: Testing For Gemstone Twinning, Dichroism, and Crystal Strain
A gemologist can conduct many different tests with a polariscope. Gemstone twinning, dichroism, and internal crystal strain are some of the properties …
Gemstone Magnetism: The Forgotten Property
Although gemstone magnetism isn’t a commonly tested gemstone property, it may be useful for making quick separations outside the lab. By Richard…
Identifying Inclusions Found in Synthetic Gems
One of the simplest ways to distinguish natural from synthetic gems is finding inclusions that can only be the result of laboratory growth. You…
Identifying Inclusions Found in Enhanced Gems
Gemstone treatments can have a significant impact on the value and stability of a stone. The following enhancement processes leave behind some…
Identifying Inclusions of Specific Gems
Imagine you find this blue gemstone for sale at a pawn shop. Can the inclusions you see help you narrow the range of possible identifications? Absolutely.…
Gemstone Facets: Terminology and Functions
Step 1: Introduction to Gemology Lesson 22 Back to syllabus Facets, those “geometrically arranged, flat surfaces” that cover faceted gemstones,…
Test Taking Tips and Strategies
Step 1: Introduction to Gemology Lesson 25 Back to syllabus One of the sad things about grading the gemologist exams is seeing people miss easy questions…
Gem Formation: How are Gemstones Created?
Most gems form naturally as minerals within the Earth. Most form as crystals, solids whose atoms are arranged in highly ordered repeating patterns…
Uncommon Elements Make Uncommon Gemstones
Why are some gems more common in nature than others? Gemology teaches us that crystalline gemstones need five things to develop: ingredients,…
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