Author

GIA Jewelry Arts Instructors

Website: http://www.gia.edu/research-resources/library/tips-from-the-bench/inde


Articles and Videos by GIA Jewelry Arts Instructors:

Touchstone Method for Testing Karat Gold Purity

There are a few scientific methods for precisely determining karat gold purity, some destructive (fire assay) and others nondestructive (X-ray florescence). Both methods require costly equipment, special procedures and a well-lit and ventilated area. A simpler method for determining gold purity in jewelry is the touchstone testing process, an age-old technique that is relatively nondestructive to jewelry and offers quick results.