Gleim the Jeweler's
Accredited Gemological Laboratories

Gleim the Jeweler maintains American Gem Society accredited laboratories at each of our locations to offer our customers the most complete jewelry identification and appraisal services possible. Our laboratories are staffed by AGS Certified Gemologists and Certified Gemologist Appraisers who are examined annually by the Society on new developments in the fields of gemology and appraising.

The AGS Accredited Gem Laboratory

In order for our laboratory to be accredited by the American Gem Society, the following requirements must be met:

1. Our firm must have at least one AGS Certified Gemologist on staff.
2. Our lab must contain a well-stocked library of gemological reference books.
3. Our lab must be equipped with at least the following gem testing equipment:


• A refractometer, a polariscope, and a dichroscope, each of which is used to show and/or measure different optical properties resulting from the interaction between gemstones and light.
• Gem scales capable of weighing to 1/100 carat, equipped for accurate determination of specific gravity.
• A binocular microscope with dark-field illumination which is capable of magnifying a gemstone to at least 30 times its size.
• An adequate light unit for use in diamond grading.
• At least five AGS Master Diamonds used for comparison in grading diamond color.
• A source of ultraviolet light for measuring fluorescence.
• A device for accurate measurement to 1/10 millimeter.
• An acceptable device for analyzing a diamond's proportions.