Advanced Labs Info Guide: GSI certificate - Gemological Science International certified

Gemological Science International (GSI) is one of the world's finest gem labs, and offers trusted certifications for gemstones.

What does GSI certificated mean? How are stones that are GSI certificate graded? What is the difference between GSI certified vs. GIA certified?

If these are your questions, this page can help to answer them.

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➥ GSI certificate
➥ GSI certified