A Message From Our Founders

“Here you can trust that your satisfaction is our ultimate goal. Our eagerness to please you should only be eclipsed by your eagerness to return.” – Steven Petrillo G.G & Staff.

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Jem Jewelers was founded in 1978 by Joseph Ermigiotti, a master bench jeweler and William Heinz, a diamond broker and jewelry wholesaler. At the time of Bill’s retirement a young energetic Gemological Institute of America (GIA) Graduate Gemologist became Joe’s partner. His name is Steven Petrillo.
Unchanged: In 2005, Joe sold his remaining shares to Steve, making him the sole owner. From 2005 to present day, Steve has made Jem Jewelers one of Southeastern Pennsylvania’s most successful prominent jewelry stores. Steve has pledged to keep the integrity of Jem Jewelers offering quality designer styles at affordable prices.
Unchanged: In 2011, Steve’s niece Lisa Marie Petrillo, also a GIA Graduate Gemologist, has joined his staff making Jem Jewelers truly a family jewelry store. Jem Jewelers staff includes GIA Graduate Gemologists, GIA Graduate Jewelers, GIA Accredited Jewelry Professionals and experienced sales people and craftsmen. Steve, Lisa Marie, and staff have many energetic, aggressive plans to continue making Jem Jewelers the spotlight of the jewelry industry.

American Gem Society Mission Statement

The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.