The Gemax Polariscope features a full visible light spectrum (400nm -700nm). Includes a conoscope (a strain-free acrylic or glass sphere on a rod) used to determine optic character in gemstones. The table glass is 40mm (Diameter) and is located over the lower polariser.

The polariscope is the fastest way to test the optical properties of gemstones, quickly determine whether translucent or transparent gems are singly or doubly refractive, resolve optic character in doubly refractive gems, spot pleochroism, and detect diamond strain. Opening at the front can double as a light source, and includes an interference figure sphere(conoscope)

It will tell you about a gemstone with ease. By simply holding the stone between the polaroid plates, you can identify the stone as being double refractive (DR) or single refractive (SR), and whether a gem material has internal strain that could cause damage to the stone easily.