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Rp.0

[GT01] Portable Calcite Dichroscope High Quality


High Quality Portable Calcite Dichroscope

Dichroscope show whether or not a stone is dichroic (reflects 2 colors).

This can be helpful in differentiating stones of the same color from one another.

Dichroscopes can be useful with identifying gemstones that are still in the rough and when stones are set and difficult to get to with other instruments.

Light entering the dichroscope is broken into two polarized rays that have vibrational directions at right angles to each other.

The two images in the dichroscope represent the polarized light and the pleochroic colors signifies doubly refractive stones except if the stone is viewed thru the optic axis. Single color in the dichroscope represents singly refractive stones.

The advantage of the dichroscope is that the two pleochroic colors that may be characteristic of a given direction in a doubly-refractive gem are seen side by side.

If no dichroism is identified in the first assessment, the stone can be turned and viewed in other directions.

Trichroic gems can also be distinguish and will reveal three colors if the stone is viewed in three directions perpendicular to each other.

 

  • Type : calcite
  • Diameter : 15mm
  • Length : 60mm
  • Body : Metal
  • Made in one part, same type like GIA's dichroscope
  •  

Operating Information :

  • Eye viewer: Hold the upper portion of the dichroscope to your eye.
     
  • Gem View: Hand hold and place the gemstone flush to the opening. The hexagonal shape at the end makes it easier to turn the dichroscope during identification.
     
  • Gem Prong: Gem Place Gemstone in the prong holder into the open space as shown above. Preparation Complete Identify Pleochroism. With gemstone visible through the Gem View opening slowly turn the dichroscope exactly 1 fullrotation. Pay close attention to any color differentiation between the two small squares visible inside the dichroscope during the rotation. That number of different colors determines the refractivity and pleochroic properties of the stone. Repeat the rotation a few times to double check the count. If you do not see color changes be sure to turn the gemstone to several other angles and repeat the process above. Sometimes the pleochroism only shows on a particular axis of the gem.

 

m stones

Basic body color

Optical type

Typical pleochroism

Colored tourmaline

Red, greed, blue, yellow

 

Uniaxial,dichroic

Usually a paler/deeper color contrast and green/brown or green/black

Chrysoberyl,deep yellow or brown

yellow

Biaxial,dichroic or trichroic

Colorless/pale yellow/yellow

Topaz,deep yellow

Deep yellow

Biaxial,dichroic or trichroic

Yellow/pale yellow/pinkish-yellow

Chrysoberyl-alexandrite

Green in daylight,red in tungsten light

Biaxial,trichroic

Green/purplish-red/yellowish in day light,green/orange/red in tungsten light

Beryl-emerald

green

Uniaxial,dichroic

Bluish-green/yellowish-green

Corundum-ruby

red

Uniaxial,dichroic

Red/orange red

Beryl-aquamarine

blue

Uniaxial,dichroic

Colorless or pale blue/sky blue or deep blue

Corundum-sapphire

blue

Uniaxial,dichroic

Blue/greenish-blue

Synthetic corundum colored by vanadium

Grayish-blue to bluish-purple in daylight,reddish-purple

In tungsten light

Uniaxial,dichroic

Brownish-green or yellowish/purplish

lolite

blue

Biaxial,dichroic or trichroic

Violet blue/paler blue/pale yellow or blue/pale yellow to near colorless,or two blues

Quartz-amethyst

Mauve,purple,violet

Uniaxial,dichroic

Purple/reddish-purple

tanzanite

Blue to violet

Biaxial,dichroic or trichroic

Treated blue stones often show deep blue/violet,untreated,trichroic blue/greenish-yellow or yelloe-brown/violet

Zircon,deep blue

blue

Uniaxial,dichroic

Colorless/sky blue

 

 

 

 

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