Gauge Metal for Diamonds, Pearls and Round Stones

Gauge will measure diameter and circumference in mm and inches. Hollow cavity to store work tools like files, tweezers, gauges, etc.

Holes are used to measure stones and extensions are used to measure mountings. Gauge has mm and carat measurements.

Allows you to estimate the size of diamond without removing it from mounting. Measure girdle diameter and use the conversion booklet provided.

15mm Capacity; Graduations 1 to 10mm; Throat 20mm.