The Gem-A Refractometer with an in-built monochromatic filter is designed to measure the refractive indices of faceted gemstones. It’s also effective for testing cabochons, carvings, and crystal faces, helping distinguish between gemstones that are optically isotropic or anisotropic. This precision instrument comes with 1.78 Refractive Index Liquid, a removable polarizing lens, and a smart travel case, making it convenient for both professional and on-the-go gem testing.

The Gem-A Refractometer is a durable tool measuring refractive indices from 1.30 to 1.81, with high accuracy of +/- 0.003. It features a pull-out eyepiece, high-quality lens, built-in monochromatic filter, and removable polarizing filter. Ideal for testing faceted gemstones, cabochons, and gemstones set in jewelry, it can determine whether a stone is isotropic or anisotropic. The unit includes a wide prism glass, stainless steel faceplate, and comes in a travel case for easy portability.

Please note that this unit requires the following items, which are not supplied: