GM-171B Motic Microscope
Zoom 7.5X – 50X

The GM171 gem microscope combines the classic Motic SMZ171 7.5X-50X stereo microscope head with a modern brightfield/darkfield gem stand in an efficient, affordable tool for the gemmological and precious minerals industry. The GM171 helps users perform identification and analysis quickly and efficiently. A generous 110mm working distance allows easy access and manipulation of the gem. The parfocal zoom ratio is 6.7:1, offering a magnification range of 7x-50x with dual-sided zoom controls and a working distance of 110mm. The head is inclined 45° and includes linear sliding interpapillary adjustment of 50mm-75mm.

Brightfield / Darkfield illumination is from powerful and consistent 6V30W variable-intensity Halogen with an aperture diaphragm adjustable from 41mm to 2mm. This allows depth of field and contrast control for easier stone identification. Incident illumination is provided by a 7-watt, 6000-degree colour temp fluorescent light box on a flexible goose neck arm. The stage offers two mounting points for a gem holder and inclusion pointer along with adaptation for optional contrasting methods like immersion or polarization.