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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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Diamond Stone Gauge Baker Style | Precision Jewelry Making Tool Accurate Stone Gauge with Carat and Millimeter Measurements
Our Price: $18.00
Sale Price: $16.50
You save $1.50!
Universal Diamond Gauge | Compact & Portable Diamond Measuring Tool 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!
Accurate Diamond Gauge | Folding Gemstone Gauge | Diamond & Gemstone Measurement Tool 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 | Accurate Gemstone Sizing Tool K & B-Style Diamond and Stone Gauge
Our Price: $6.50
Sale Price: $5.67
You save $0.83!