As a leading company in the supply of gemological microscopes, OPTIKA offers a series of
microscopes purposely designed for this sector by using both brightfield and darkfield methods
OPTIGEM-10 and OPTIGEM-20. This series has been designed and manufactured in order to satisfy
the requests of a very demanding industry; brightfield/darkfield, immersion analysis, light color temperature: no detail has been left to chance.
Specifically Designed for Specialists
Gemological stereomicroscopes are meant to help with stone inspection. Jewels and gems have a
variety of grades (or quality levels), which ultimately influence their value and cost on the market;
therefore it is important to have solutions that are purposely designed for gemology.
These stereomicroscopes are equipped with iris and darkfield condenser on the bottom light
source, and with a set of on stage tweezers to hold the stone in place.
Much More Than Gemological Stereomicroscopes
OPTIGEM-10 & OPTIGEM-20 are two-in-one gemology instruments that can be used both in
vertical and horizontal position in a very easy way, just by turning one knob (no disassembling
and re-assembling operations are required). The horizontal position extends the use of a
gemological microscope, giving the possibility to perform immersion analysis by submerging a
sample in liquid. If the stone’s refractive index is close to the liquid’s one, immersion makes the
interior more visible by reducing the effects of refraction and surface reflection. This enables you
to see a gem’s inclusions or color distribution more easily.
Immersion is also necessary to see crystal growth structures, which might help you separate
natural from synthetic corundum. Features like curved growth striae in flame-fusion synthetics, or
separation planes in assembled stones, are often far easier to see when the stone is immersed.
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Vertical position for standard gem
analysis with darkfield illumination
and polarizing tecnique
Incredibly Versatile Operations
OPTIGEM Series offers multiple options for illumination and contrast techniques, such as
incident, transmitted and oblique brightfield darkfield, polarization and immersion analysis
only on Optigem 10 & 20. They come with a special optical condenser configuration to
ensure real, perfect darkfield application (see the dedicated chapter for further information).
Horizontal position for
immersion gem analysis
Stereozoom Microscopes For Gemology
Ultrabright LED Condenser for Optimized Illumination
An ultrabright LED-based electronic condenser with intensity control allows to switch from
brightfield to darkfield; it also produces perfectly the colour of daylight.
The condenser uses a new optical configuration especially created in order to obtain a perfect
darkfield application.
With darkfield observation, the unscattered beams from the image are excluded: as a result, the
field around the specimen is generally dark.
An additional flexible arm and velvet-field slider produce extra contrast for crisp and vibrant
images. The illumination of OPTIGEM microscopes is greatly performing and this brings this
series to be ideal for precious stones and jewels evaluation.
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Get the most out of our accessories
A wide range of optional accessories completes these instruments: from gemology
clip, iris aperture diaphragm, polarization analysis kit, optical unit to switch
the darkfield from a “sharp” (gem exhibition) to a “soft” (diamond
analysis) mode, translating cell holder with vacuum pick-up
and quartz immesion cells complete and enhance the
OPTIGEM-10 & OPTIGEM-20 performances. All the
accessories can be stacked, in any order, while using
the microscope both horizontally and vertically.
ST-202
ST-202 - Polarizing analysis kit
Polarization technique allows to quickly determine if the stone at hand
is isotropic or anisotropic or, at best, to determine the optic character of
gemstones (twin planes, strain, pleochroism, etc.). It is also the preferred
tool for separating synthetic Quartz from its natural counterparts. In
addition, the polarizing microscope may be very useful for distinguishing
solid inclusions from negative inclusions as well as for spotting
polysynthetic twinning.
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Applications
Some application examples demonstrating the performance
of OPTIGEM Series, especially designed to observe samples
of precious stones and jewels and provided with specific
features for gemological needs.
Legend
1. Inspection of stones with OPTIGEM-10.
2. Inspection of stones with pure white darkfield illumination.
3. Immersion cell (ST-203) on a translating support (ST-204).
4. Sample of Citrine.
5. ST-201 accessory creates a soft darkfield illumination
ideal for diamond analysis.
6. Optigem can be easily rotated to a horizontal working
position.
7. ST-201 accessory for analysis under polarized light.
8. Working with Optigem and its accessories (they can be
stacked for increased functionality).
GEM Series
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GEM Series - OPTIGEM10 model
Binocular gemological stereomicroscopes for brightfield and darkfield applications with special side-emitting LED illumination ring for true darkfield
illumination. Equipped also with 4 incidentLED flexible arm and a diffusive LED disc for transmitted illumination.
The instru ment can be easily tilted horizontally for immersion analysis.
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Inspection & Industrial
0.7x÷4.5x
X-LED
3W LED
4W LED
DFDF
AB030
PartDescription
Observation mode: Brightfield, darkfield.
HeadsBinocular, 45° inclined, 360° rotating.
Interpupillary distance:
Dioptric adjustment: On both eyepiece tubes.
Eyepieces:WF10x/21 mm, high eye-point.
Objective:
Working distance:
Specimen stage:
Focusing:
Stand:
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Adjustable between 51 and 75 mm
Parfocal achromatic zoom 0.7x...4.5x (zoom factor 6.43:1).
100 mm
Gemological stage, with clamp for holding gems.
Rack and pinion mechanism controlled by a pair of knobs.
Fixed arm stand with tilting system (with position lock control).
It can be totally overturned and rotated allowing in this way
to obtain a 2-in-one instrument: an instrument for standard
observations and one for obser vation of water-immersed gems.
PartDescription
Darkfield
illumination:
Transmitted light
llumination:
Incident
illumination:
Color temperature:
Equipped with a state-of-the-art illuminator for
darkfield observation. It consist of an innovative sideemmiting LEDs ring with an emission angle of 38°. With
brightness control.
Equipped with a LED illuminator, located under the stage.
With brightness control.
Equipped with a flexible gooseneck-arm 4-LED
illuminator. With brightness control.
Pure white 6,300 K
GEM Series - OPTIGEM20 model
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Trinocular gemological stereomicroscopes for brightfield and darkfield applications with special side-emitting LED illumination ring for true darkfield
illumination. Equipped also with 4 incidentLED flexible arm and a diffusive LED disc for transmitted illumination.
The instru ment can be easily tilted horizontally for immersion analysis.
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0.7x÷4.5x
X-LED
3W LED
4W LED
Inspection & Industrial
DFDF
AB030
PartDescription
Observation mode: Brightfield, darkfield.
HeadsTrnocular, 45° inclined, 360° rotating.
Interpupillary distance:
Dioptric adjustment: On both eyepiece tubes.
Eyepieces:WF10x/21 mm, high eye-point.
Objective:
Working distance:
Specimen stage:
Focusing:
Stand:
Adjustable between 51 and 75 mm
Parfocal achromatic zoom 0.7x...4.5x (zoom factor 6.43:1).
100 mm
Gemological stage, with clamp for holding gems.
Rack and pinion mechanism controlled by a pair of knobs.
Fixed arm stand with tilting system (with position lock control).
It can be totally overturned and rotated allowing in this way
to obtain a 2-in-one instrument: an instrument for standard
observations and one for obser vation of water-immersed gems.
PartDescription
Darkfield
illumination:
Transmitted light
llumination:
Incident
illumination:
Color temperature:
Equipped with a state-of-the-art illuminator for
darkfield observation. It consist of an innovative sideemmiting LEDs ring with an emission angle of 38°. With
brightness control.
Equipped with a LED illuminator, located under the stage.
With brightness control.
Equipped with a flexible gooseneck-arm 4-LED
illuminator. With brightness control.
Pure white 6,300 K
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GEM Series - Comparison chart
ModelHeadEyepieces ObjectiveStandIllumination
OPTIGEM-10 Binocular,
360° rotating,
45° inclined
OPTIGEM-20 Trinocular,
360° rotating,
Inspection & Industrial
45° inclined
Wide Field
10x/21mm
Wide Field
10x/21mm
0.7 .... 4.5x
Zoom
0.7 .... 4.5x
Zoom
Gemological
stand
Gemological
stand
Incident illumination: 4 LED exible arm with brightness adjustment.
Transmitted illumination: Diusive LED disc for obser vation in brighteld and
side-emitting LED ring for observation in darkeld.
Incident illumination: 4 LED exible arm with brightness adjustment.
Transmitted illumination:Diusive LED disc for obser vation in brighteld and
side-emitting LED ring for observation in darkeld.
GEM Series - Optical Performance
OPTIGEM-10 / OPTIGEM-20 - Optical performance
Eyepiece10x (ST-081)15x (ST-082)20x (ST-083)
Field number (mm)
ObjectiveTotal magnication Field of View (mm)Total magnication Field of View (mm)Total magnication Field of View (mm)
ST-081 EW10x/21 eyepieces (pair), high eyepoint, with rubber cup
ST-082 WF15x/15 eyepieces (pair), high eyepoint
ST-083 WF20x/10 eyepieces (pair), high eyepoint
ST-084 WF10x/21 micrometric eyepiece, high eyepoint, with rubber cup
15104 Cleaning kit
DC-002 Plastic dust cover, medium, 490(l)x490(h) mm
M-005 Micrometric slide, 26x76mm, with 2 scales (1mm/100 & 10mm/100)
ST-092 Protective glass for stereohead
ST-201 Iris aperture diaphragm for darkfield
ST-203 Glass immersion cell
ST-204 Translating cell holder
ST-205 Vacuum pick-up (with electric vacuum pump)
ST-207 Iris aperture diaphragm for brightfield
AB-030 Antibacterial surface treatment, only for newly purchased microscope
Inspection & Industrial
15104 - Cleaning kit
It cleans glass quickly and effectively, without leaving residue or odor. Ideal for precision lens or prism cleaning.
How to connect the cameras to our microscopes.
Please refer to the Adapter reference list on Digital section.
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v 6.8.0 - OPTIKA reserves the right to make corrections, modications, enhancements, improvements and other changes to its products at any time without notice.