Gershburg, Mark Trademarks
GSI
Certificates of authenticity and grading of gemstones
Owned by: Gershburg, Mark
Serial Number: 78630742
GEMOLOGICAL SCIENCE INTERNATIONAL
Certificates of authenticity and grading of gemstones
Owned by: Gershburg, Mark
Serial Number: 78630746
GSI
printed certificates featuring information about authenticity and grading of gemstones
Owned by: Gershburg, Mark
Serial Number: 78633392
