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New Professional Portable Calcite Dichroscope Gemological Gem & Gemstone Tools, Free Shipping
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New Professional Portable Calcite Dichroscope Gemological Gem & Gemstone Tools, Free Shipping
New Professional Portable Calcite Dichroscope Gemological Gem & Gemstone Tools, Free Shipping
New Professional Portable Calcite Dichroscope Gemological Gem & Gemstone Tools, Free Shipping

New Professional Portable Calcite Dichroscope Gemological Gem & Gemstone Tools, Free Shipping

Price: $44.50 add to cart     
Feedback: 93.71%, 173 sales Ask seller a question
Shipping: US-Mainland: free (more destinations)
Seller's Country: China
Condition: Brand new
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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





100% Brand New

Tax: We are unable to take any responsibility for any custom duty or import tax. But we will write lower value on package.

Payment details: Paypal only. And we only ship to Paypal address.

Shipping methods: We will ship by Hongkong Post Registered Air Mail with tracking number. Link to track parcel’s status: http://app3.hongkongpost.hk/CGI/mt/enquiry.jsp

Shipping times: All items will be shipped within 48-72 business hours upon receipt of payment (except Saturday and Sunday).

By Post Air Mail, it takes 10-25 days to arrive. (Eastern Europe, the Middle East, South America takes longer time). As delivery time is highly depended on postal service and local customs/duties, please give us enough time to transit. If you do not receive your item on time, please contact us immediately for further assistance. Thank you for your understanding.

Aftersales:

12 months Warranty. Buy with confidence!

We will check the goods quality before shipment. If there are some unexpected problems happen, we hope to solve the problems with buyers through friendly ways.

1. If there are quality problem, buyers can submit argue within 7 days after receiving the goods, buyer must provide photos or video and other evidence to seller for identify. The buyer return the goods to us, and we will send you a new product.

2. Man-made hazards, buyers take full responsibility.

Feedback:

1) We depend on our customers' satisfactory to succeed. Therefore, your feedback is extremely important to us.

2) If you are satisfied with our items,please leave us positive feedback, we will leave a positive feedback to you later.

3) Contact us by email before you leave any negative or neutral feedback, we will deal with you to solve the problems as soon as possible.

Other policies:

Serious Buyer Only! Please place bid only if you agree with all the terms
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Last Updated: 20 Aug 2015 00:13:46 PDT home  |  about  |  terms  |  contact
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