Most of the world's diamonds and gemstones are already set into jewelry. GTLI's expertise in the analysis and documentation of finished jewelry items is unrivaled anywhere. This work is more complex than the analysis of loose stones.

GTLI was the first lab to develop jewelry identification reports and is the leader in this field today.

Without disassembling heirlooms or complex pieces, GTLI has developed techniques for providing expert and impartial analysis of a jewelry item's precious stones, total carat weight, color, clarity, natural origin, and details of mounting. Clear documentation and photographs are issued for every item. These standardized photos are extremely useful for consumers, showing details of craftsmanship that may not be visible otherwise.