The polariscope

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is used to test cut or rough gemstones. Two polarising filters allow to observe the structure and optical properties of precious stones or minerals.

The stone is tested by rotating it 360░, between the crossed polarising filters.

Pocketpolariscope


Table Polariscope 220volt
The isotropic or cubic mineral stays dark and unchanged.
The anisotrop or birefringent mineral produces a light and dark blinking, 4 times during one rotation of 360░.
Attention a minearal which is observed in the direction of the C axis, behaves like isotopic. It is therfore necessary to observe all minerals in more than one direction.
The micro cristalline mineral stays bright permanently.
Internal tensions become visible. Like clouds passing over the stone during its rotation. This effect is demasking synthetic spinells of the Verneuil type. Certain diamonds and garnets may produce a similar effect.

The polariscope is used to test quantities of stones either cut or rough.
It allows you to place the tested stone in one of these 4 groups:

isotropic
unirefringent
cubic
amorphous
Analcime
Cubic Zirkonia
Cuprite
Diamond
Djevalite
Fabulite
Fluorite
Gahnite
Garnet
        Almandine
        Andradite
        Topazolite
        Demantoid
        Grossular
        Hessonite
        Melanite
        Pyrope
        Rhodolite
        Spessartite
        Tsavorite
        Uvarovite

Hauyne
Melanite
Periklas
Pollucite
Sphalerite
Spinel
YAG
Glass
        Moldavite
        Obsidian
        Tektite
   
anisotrope
birefringent
Anatase
Apophyllite
Skapolite
Vesuvianite
Wulfenite
Zircon
Apatite
Benitoite
Beryl
        Aquamarine
        Bixbit
        Goshenite
        Heliodor
        Morganite
        Emerald

Zinkite
Calcite
Dioptase
Corundum
        Ruby
        Sapphire

Phenakite
Quartz
        Amethyst
        Ametrine
        Rockcrystal
        Smoky Quartz
        Citrine

Rhodochrosite
Turmaline
        Dravite
        Indigolite
        Rubellite


Andalusite
Anglesite
Cerussite
Chrysoberyl
        Alexandrite
Enstatite
Hemimorphite
Kornerupine
Cordierite
Peridot
Phrenite
Sinhalite
Topaz
Zoisite
        Tanzanit
Azurite
Diopside
Epidote
Euclase
Feldspar
        Amazonite
        Labradorite
        Mikroklin
        Moonstone
        Orthoclase
        Oligoclase
        Sunstone
        Sanidine

Clinohumite
Petalite
Spodumen
        Kunzite
        Hiddenite

Staurolite
Titanite
Vivianite
Amblygonite
Axinite
Disthene, Cyanite
Ulexite
   
micro cristallic
Amber
Opal
        Fireopal
Agate
        Aventurine
        Calcedony
        Carneol
        Chrysoprase
        Moosagate
   
false double refraction
due to internal tensions
Diamond
Garnet
Amber
Synthetic Spinel
Plastics

The conoscope is an acessory to the polariscope and allows to visualise the axes of doubly refracting stones.

More information and pricelist here