London Dichroscope

The London Dichroscope is a compact gemological instrument used to observe pleochroism in transparent and translucent colored gemstones. By revealing differences in body color when viewed from different crystal directions, it helps gemologists distinguish many doubly refractive gemstones from single-refractive simulants. A quick glance through the viewing windows can reveal subtle color shifts that might otherwise go unnoticed. Features Designed to detect pleochroism in colored gemstones. Uses polarized light technology to display color differences side-by-side. Provides two viewing windows for easy color comparison. Helps distinguish many doubly refractive gemstones from single-refractive imitations. Compact handheld format suitable for fieldwork, trade shows, and laboratory use. Reduces eye strain compared to traditional prism-based viewing methods. Simple operation with no power source required. Specifications Specification Value Instrument Type Dichroscope Primary Function Pleochroism Observation Viewing Method Dual Polarized Viewing Windows Application Gemstone Identification and Examination Notes For best results, use a strong, evenly distributed white light source. View transparent or translucent colored gemstones with light passing through the stone. Rotate both the gemstone and the instrument to locate the direction showing the strongest color contrast. Pleochroism strength varies depending on gemstone species and crystal orientation.