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.
Every Dichroscope come with a Leather Soft Case and 1 year warranty!
Gemstones
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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