| Magnification |
For routine gemological observations magnifications to 30X are sufficient, but higher magnifications to 60X+ are occasionally required*. |
| Eyetubes |
The eyetubes should be horizontally adjustable, preferably with diopter adjustment*. |
| Optics type |
Zoom type pod is preferred*, but fixed type may be used. |
| Working distance |
Working distance (between the microscope and the gem) should be minimum 80-85mm, so the user can manipulate the gem comfortably*. |
| Focusing |
Nearly all microscopes provide coarse focusable rack-and-pinion mechanism. However, dual (coarse and fine) is highly desirable because the gem can be easier focused at high magnifications*. |
| Inclination |
Inclined (tilted) gemological base* is often desirable; in all cases, the tilted mechanism eventually loosened and must be re-tighten*. |
| Rotation |
Rotating around its base feature* is desirable, but not necessary. |
| Lighting |
Lighting conditions where the gem is observed is of paramount importance. Successful microscopic observations depend on the proper positioning the gem under suitable lighting environment, something that cannot be taught, but gained only by experience. A combination of dark-field effect and incident pinpoint lighting provide great flexibility in illuminating the stone*. The recommended lamp type should be LED because is heatless, has long-life expectancy and emits white light at specific color temperature*. |
| Tweezers |
Wire tweezers are widely used where the stone is held between the wires, standard feaure in nearly all miscopes inthe market*, but often the wires are misaligned and the gem cannot be held securely. For endless manipulation and positioning the gem, magnetic ball base mechanism is desirable feature (maxxiLEDscope optional). |
| Light controls |
Pilot lights, proper light dimmers and other features are equally important and depend on the design and quality of the parts used in fabricating the microscope*. |
| Quality |
Brand name microscopes are available at hefty prices, but the latest models made by high-end Chinese microscope makers meet the requirements for gemological applications at reasonable prices. |
