Presidium PGI Gem Indicator NSK Accepts a 7

Accepts a 7

2mm round center stone

Featuring 12 precisely sized bead cavities ranging from 0

professional grip during extended use

Top jaws are integrated into the unit and are not removable

Presidium PGI Gem Indicator NSK Accepts a 7The Presidium Gem Indicator (PGI) is the only handheld tester specifically designed for colored gemstones. Using advanced thermal conductivity technology, it can identify up to 31 different gem types and includes a color input function with 12 common gemstone colors for even greater accuracy. A clear digital LED screen ensures easy to read results, while the patented changeable probe tip delivers reliable, long term performance. The PGI is a