Precision Gem Grading Laboratory (PGGL) offers diamond grading and appraisal services for diamonds and mounted diamond jewelry to consumers and trade.
Using the world’s most advanced, state-of-the-art equipment by ImaGem® , PGGL grades diamonds, gemstones, and jewelry on light behavior, the 4 Cs, fluorescence and more. ImaGem’s patented direct measurement technology enables us to achieve very high levels of accuracy and repeatability.
High levels of accuracy and repeatability in grading are important to everyone in the business, especially the end consumer. An error of just one grade in measuring the color, clarity or light behavior of a diamond can change the value of a diamond anywhere from a few hundred to a few thousand dollars.
We offer Light Behavior certificates for mounted diamond jewelry as well as loose diamonds. A wide range of grading certificates (with information on 4Cs, light behavior, fluorescence and more) are available for loose diamonds or diamond jewelry. Appraisal services for gemstones, jewelry, diamonds and diamond jewelry for insurance, estate evaluation etc. are also available.
As more consumers become aware of the dangers of diamond switching, they are starting to put their faith in non-invasive diamond registration services to secure their diamonds. There is always a risk that diamonds may get switched during repairs, manufacture, cleaning etc. Our newest service, ImaGem Secure Diamond Registration, is available to record the identity of your diamond jewelry for verification or confirmation as needed.
For more information or to set up an appointment, call +1.215.774.9406 or send an email to info@pgglab.com.
Precision Gem Grading Laboratory is owned and operated by ABM, LP, a Pennsylvania Corporation.