sapphire

Trigon inclusions are part of a natural, uncut diamond’s original crystal structure. These were photographed on the surface of a rough…

Disclosing enhancements is one of the most important responsibilities gemologists face. In fact, many countries are passing stricter laws…

Use these gemology cheat sheets to review color and clarity grading, as well as special information on diamond and opal. You can also review basic…

Step 3: Practical Gemology Lesson 28 Back to syllabus While preparing this lesson in gemstone examination, I was in the process of professionally…

Step 3: Practical Gemology Lesson 29 Back to syllabus We’ve designed a series of realistic gem identification quizzes for gemology students.…

Step 3: Practical Gemology Lesson 4 Back to syllabus Gemstone identification is like detective work. You gather clues and eliminate suspects…

The polariscope is one of gemology’s simplest and most useful tools. With a little practice and our three-part polariscope guide, you’ll…

Step 3: Practical Gemology Lesson 16 Back to syllabus Since diffusion treated gems are so common, gemologists must learn how to identify these…

Although gemstone magnetism isn’t a commonly tested gemstone property, it may be useful for making quick separations outside the lab. By Richard…