British Standard Plastic Ring Gauge Set of 26, Rings A-Z

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.

For measuring diamonds and stones. Capacity 0.10 to 4 carats

K&B Diamond and Stone Gauge. Measures loose or mounted stones from 3 points to 4 carats. Birthstone chart on reverse.