Good Price Very Good Instrument Portable Gem Polariscope Model FFP-30 Central Device for Gemstone Identification Perfect in the Field Buy Now!

Specifications

Model: Portable Gem Polariscope Model FFP-30.
Diameter of polarizer: 30mm; with rotating sample stage
Light source: White LED light source
Power supply: Battery
Dimensions: 85 mm x 35 mm
Weight: 100 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 while completing 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, which means that the stone remains dark (extinguished) at all angles when you rotate it. 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 (e.g. chalcedony and jade)

Applications

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

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