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The 4 Cýýýs of gemstone education.

If you are making a major gem purchase, you may want a second opinion: a report from an independent gemological laboratory that confirms that the gemstone you are buying is being represented accurately.

A gemstone laboratory report is like Carfax or an engineer’s report on a house: it is an independent confirmation of the identity of the gem and what it has gone through before it has reached you. The report confirms the gemstone variety and natural origin of the gem and includes information on any enhancement or treatment. A report may also include information about where the gemstone was mined, based on a study of its inclusions.

A laboratory report isn’t like a house appraisal, though: it doesn’t include an estimate of the gem’s value. We include more information on gemstone and jewelry appraisals below.

To make sure that consumers have access to the protection of high quality colored gemstone reports based on the latest research and technology, the non-profit American Gem Trade Association founded the AGTA Gemological Testing Center in New York in 1998.

The 4 Cýýýs of gemstone education.

The 4 Cýýýs of gemstone education.

The Gemological Testing Center monitors the market and researches new gem deposits and new methods of treatment. Headed by Dr. Lore Kiefert, the AGTA laboratory is equipped with the latest technologically advanced investigative equipment.

The laboratory offers consumers the peace of mind of independent confirmation of gem identification, pearl identification, enhancement evaluation, and origin determination.

Your jeweler will often offer you a report from the AGTA Gemological Testing Center or another lab with a major gemstone purchase. In cases where a gemstone does not have a report, you may request one. But remember: there is no official regulation of who can offer a report. Some reports are reliable and some are just fancy letterhead with some guy's signature.

Reports are an important way to make sure you know as much as possible about your gemstone. But you should always make your final purchase decision based on the beauty of the gem, not just what it says on a piece of paper. Gemstones do store wealth and are an excellent way to pass down something fine and valuable to the next generation, but don't think of them as an investment: enjoy them today also!


An appraisal is an estimate of a gemstone's value by a third party. This appraisal is often based on the information contained in a lab report, since independent appraisers rarely have access to the kind of advanced equipment that major gemstone laboratories use to test gems.

In some cases, an appraisal is helpful in building your confidence in the buying decision. It can also be very helpful if you are considering selling an item or want to insure your jewelry.

If you decide you do need an appraisal, be aware that the jewelry appraisal industry is not regulated. The appraiser is just giving you an opinion about value that may or may not be correct. Some appraisers are very skilled and reputable but, because anyone can call themselves an appraiser, some unfortunately are not. Exercise caution with appraisers who have a commercial interest in the value they assign to the piece.

If you would like to make sure you are dealing with an appraiser who has a wide knowledge of gemstones, you should consider consulting an AGTA member appraiser. These members are involved in the gemstone market and have a closer perspective on values. They have also pledged to uphold the AGTA code of ethics to put the customer’s interest first.

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The 4 Cýýýs of gemstone education.

Gemtech Int'l. Corp.  D/B/A Yosepha Jewelry Designs
Member

American Gem Trade Association
Manufactors Jewelers and silversmith Association
Southern Jewelers Association
Ohio Jewelers Association
Jewelers board of Trade



Colored gemstone information and jewelry fashion from the non-profit American Gem Trade Association

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Toll Free: (800) 436-3236