Good Price Very Good Instrument Stationary Gem Polariscope Model FTP-49 White LED Light Source & Conoscope Central Device for Gemstone Identification Quality Instrument Buy Now!

Specifications

Model: Gem Polariscope FTP-49.
Diameter: 49 mm polarizer, removable
Upper polarizer: Freely rotates 360°
Lower polarizer: Fixed
Light source: Long-life white LED light source
Power supply: Equipped with adapter (SE)
Accessories: Equipped with 10 mm Conoscope (Interference ball)
Dimensions: 110 mm x 70 mm x 140 mm
Weight: 570 g
Material: Metal

User information:

1. Turn on the lamp and rotate the upper polarization filter until the correct position is reached to obtain maximum illumination where the field should not be completely dark.
2. Place the stone over the rotating sample plate. It can be held by hand or with pliers and
3. Observe the brightness of the stone as it changes as you complete the 360° rotation.

The instrument helps you separate stones into the following three main groups:

Isotropic (singly refractive) materials: Light passing through the stone does not change, causing the stone to remain dark (extinguished) at all angles when rotated. This is typical of amorphous materials and cubic crystals (e.g. glass, diamond, spinel and garnet).

Anisotropic (birefringent) materials: The stone splits the light into two beams. When the stone is rotated on the polariscope, it will flash alternately bright and dark (four bright and four dark positions per revolution). This applies to ruby, sapphire, emerald, topaz and tourmaline, for example.

Aggregate: Consists of many small crystals grown together that can give a constant, evenly illuminated glow without flickering (for example, chalcedony and jade)

Applications

Authenticity check: Can quickly distinguish real gemstones from glass and other imitations.

Internal stresses: Can detect abnormal stress patterns (so-called "anomalous double refraction"), which often reveals whether a diamond is synthetic or whether a stone has undergone glass filling.

Interference patterns (Conoscope): An accessory that helps to see optical interference figures and determine whether the stone is uniaxial or biaxial.