Step 3: Practical Gemology

Lesson 29

We’ve designed a series of realistic gem identification quizzes for gemology students. Each will give you a better idea of how to proceed based on the information at hand. This will help you learn not only the identification process but also time saving short cuts.

If you’ve missed it, try taking this sample gem identification quiz, too.

The following three quizzes focus on how to conduct a gemstone visual examination. Whether you’re trying to identify rough or cut stones or verify grades, you must learn to recognize what you see.

Examining a Rough Gemstone: Quiz 1

You’ve received a piece of rough to identify. First, you clean it carefully. Next, you give it a thorough visual exam, using your unaided eyes, a loupe, and a microscope. In the process, you find the following bits of visual information.

1. What optical feature do you see here?

color zoning - gemstone visual examination

2. What physical feature do you see here?

conchoidal fractures - gemstone visual examination

3. In the following picture, what inclusions do you find?

red rutile needles - gemstone visual examination

4. What kind of inclusions can you see in the following picture?

negative crystals - gemstone visual examination

Rough Gemstone Visual Examination Advice

Some people have difficulty determining the identity of…