Book Gauge

Book Gauge

Available in stock

Purpose: To quickly determine the approximate carat weight of a diamond without having to remove it from its setting.
Components: The tool consists of a gauge, which is typically a metal instrument with a caliper-like mechanism, and an accompanying book or chart. The gauge is used to measure the girdle diameter (the widest part of the diamond).
Function: Once the girdle diameter is measured with the gauge, the book or chart is used to cross-reference this measurement with the corresponding approximate carat weight.
Identification: The particular tool in the image is referred to as Diamond 180 Gauges Jewellery Tools CTS 700, according to web page titles associated with similar images.
Application: These gauges are widely used in the jewelry industry by jewelers, appraisers, and others involved in the diamond trade. They can be used for various diamond shapes and cuts. Some gauges can also measure the depth of the diamond.