The phrase “evaluate a gemstone” means to identify it and assign a grade to it. Although this is an oversimplification of a complex subject, it allows us to point out the difference between evaluate and valuate. When we valuate a gemstone or any other piece of jewelry, it means that we place a value on the item. This is where one’s training in appraisal theory, ethics and methodology becomes very important.  Since this training is one which is not offered by the Gemological Institute of America, it must be obtained elsewhere.  The organizations listed below are highly recommended choices for gaining this knowledge:

National Association of Jewelry Appraisers

American Society of Appraisers