Droste’s is the national home to the United States Gemological Laboratory. The United States Gemological Laboratory is staffed by Droste's two AGS Certified Gemologist- Appraisers who specialize in providing certified quality reports for diamonds and gemstones to members of the jewelry and diamond industry.

The United States Gemological Laboratory will also provide certifications of diamond quality to individuals outside the jewelry trade. If you need a certified report of diamond quality for your diamond, let Droste's trained Certified Gemologists- Appraisers provide you with a (USGL) diamond certification.