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Jewelers use these Accurate Diamond Gauge. The holes in this gauge are used to measure stones, while the extensions are used to measure mountings. One side shows millimeters and the other shows corresponding carat measurement.

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Universal Diamond Gauge: Precision instrument for measuring round, baguette, square, pear, and marquise cut diamonds from 0.01 to 4 carats. Universal Diamond Gauge
Our Price: $25.00
Sale Price: $21.82
You save $3.18!
Universal Diamond & Gems Gauge | Compact & Portable Diamond & Gems Measuring Tool Universal Diamond Gauge
Our Price: $24.47
Sale Price: $23.92
You save $0.55!
Professional Diamond Carat Gauge: Compact aluminum tool for measuring round and baguette cut gemstones from 0.01 to 2.1 carats Professional Diamond Carat Gauge | Compact and Easy to Use
Our Price: $7.33
Sale Price: $6.96
You save $0.37!
K & B-Style Diamond and Stone Gauge – Precision Tool for Jewelry Pros K & B-Style Diamond and Stone Gauge
Our Price: $6.50
Sale Price: $5.67
You save $0.83!