Gem Polariscope | Gemstone Identification Tools

Application
Gemstone Interference Pattern

The gem polariscope is widely used to differentiate between isotropic and anisotropic gemstones and to identify microcrystalline or cryptocrystalline aggregates. It also helps determine whether a birefringent gemstone has uniaxial or biaxial optical properties. For optimal results, the polariscope should be used in combination with other gemological tools such as a refractometer, UV fluorescence lamp, and microscope. Together, these gem testing instruments provide a comprehensive approach to gemstone identification.

After determining that the gemstone is anisotropic, the interference sphere can be used to further analyze its optical axis properties.

Uniaxial interference figure

Biaxial interference figure Uniaxial interference figure

FTP-49 Tabletop Polariscope

Inquiry

Material	Metal
Polariscope	Tabletop type
Voltage	100V-240V
Size	110×70×145mm
Weight	570g
Accessory	10mm conoscopic lens ×1
Packaging	Standard rigid cardboard box packaging

Features

49mm large-aperture polarizer with a detachable design
High-quality polarizer with a fully rotatable upper polarizer (360-degree adjustment) for flexible observation. The lower polarizer remains fixed for stable measurements.
High-brightness, long-lasting white LED cool light source, providing stable illumination while protecting the polarizer.
Specimen stage: 360-degree smooth rotation for flexible positioning.
Conoscopic lens: High-intensity focusing lens for enhanced optical clarity.

FTP-LED Tabletop Polariscope

Inquiry

Material	Metal
Polariscope	Tabletop type
Voltage	100V-240V
Size	110×70×145mm
Weight	650g
Accessory	18mm conoscopic lens ×1
Packaging	Standard rigid cardboard box packaging

Features

49mm large-aperture polarizer with a detachable design
High-quality polarizer with a fully rotatable upper polarizer (360-degree adjustment) for flexible observation. The lower polarizer remains fixed for stable measurements.
High-brightness, long-lasting warm white LED light source, designed to simulate incandescent lighting. It enhances interference pattern observation while ensuring stable brightness and protecting the polarizer.
Specimen stage: 360-degree smooth rotation for flexible positioning.
Conoscopic lens: High-intensity focusing lens for enhanced optical clarity.

FTP-DCL Tabletop Polariscope

Inquiry

Material	Metal
Polariscope	Tabletop type
Voltage	100V-240V
Size	135×82×150mm
Weight	710g
Accessories	18mm conoscopic lens ×1
Packaging	Standard rigid cardboard box packaging

Features

49mm large-aperture polarizer with a detachable design
High-quality polarizer with a fully rotatable upper polarizer (360-degree adjustment) for flexible observation. The lower polarizer remains fixed for stable measurements.
Supports dual light source switching. Warm light (3200K-3800K) enhances visibility when observing gemstones with low transmission. White light (6000K-6500K) aids in detecting pleochroism. Both light sources ensure stable brightness.
Specimen stage: 360-degree smooth rotation for flexible positioning.
Conoscopic lens: High-intensity focusing lens for enhanced optical clarity.

FPP-30 Handheld Polariscope

Inquiry

Material	Full black aluminum alloy casing
Polariscope	Handheld type
Size	35×85mm
Weight	130g
Accessory	12mm optic glass conoscope for option(non-standard accessory)
Packaging	Leather case packaging

Features

Powered by a 3V button cell battery, enabling portable use
25mm diameter polarizer
High-quality polarizer with a fully rotatable upper polarizer (360-degree adjustment) for flexible observation. The lower polarizer remains fixed for stable measurements.
Long-lasting white LED cool light source
Removable specimen stage for easy adjustment and versatility
No conoscopic lens included (optional glass conoscopic lens available).

Accessories

Conoscope Interference Sphere Ball, FTP-XZG

Conoscope Interference Sphere Ball, FTP-ZG