Kuntal.Org

A polariscope is an essential tool for gemologists, utilising polarised light to identify various optical properties of gemstones. This instrument consists of two polarised filters — one at the top (analyzer) and one at the bottom (polarizer). When these filters are aligned at right angles to each other, the field between them remains dark, a setup known as the “crossed position.” This arrangement helps in determining whether a gem is isotropic, anisotropic, anomalously double refractive, or an anisotropic aggregate.