Category: Gem Testing

Color Filters: Useful Tools that Gemologists Should Use But Often Don’t

Posted on February 28, 2022 by Charles Evans, FGA

All qualified gemologists will have encountered color filters. This ‘encountering’ may take place during their gemological studies and might be as far as they get. They are losing attention and though there are obstacles, we should return to their teaching.

Gem Testing

Separating Blue Topaz from Aquamarine, Part II

Posted on November 1, 2021 by Cara Williams, FGA

The basic gem testing articles offer tips on quick methods of testing using basic instruments. With practice basic tools can provide reliable indications of a stone’s ID. No tool on its own is a substitute for thorough gemological testing. So, keep in mind that when in your lab with more advanced equipment available, do not stop short at these simple tests.

Gem Testing

Basic Gem Testing

Posted on September 1, 2021 by Cara Williams, FGA

One-step testing is a tempting proposition; however, it requires extensive knowledge and experience to perform the minimum number of tests required for accurate and conclusive identification.

Gem Testing

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