Gemological Science Info Guide: GSI certified - GSI certificate - Diamond ReportingGemological Science International (GSI) is one of the world's largest gemological laboratory. GSI provides reliable, fast, and professional gemstone identification as well as grading and appraisal services to the global fine jewelry industry. GSI is the only major gemological laboratory established in the 21st century. Within a relatively short period of time, GSI has grown to become one of the largest gem labs in the world.
Diamond and Diamond Jewelry Grading
Colored Gemstone Identification…
Virtual Vault™: Our Report Registry
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➥ GSI certified
➥ GSI certificate