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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We are suppliers of weighing scales from pocket scale, jewellery carat scale, high precision balance to analytic balance and calibration weights. We also offer a variety of jewellery tools and power inverters, such as diamond tester, gem filter, jewellery loupe, polariscope, dichroscope, spectroscope for jewelers, craftspeople, hobbyists and others. We have been providing our customers with the service and quality they come to expect.

 

Payment details: We accept Paypal ONLY. And we only ship to Paypal address. Before you pay, please make sure your address in Paypal matches the address you would like us to ship to. 

 

Shipping methods: We will ship by I Intl' Registered Air Mail or Air Parcel with a tracking number. We can send by Express delivery, but need extra charges.  

 

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

 

By express, it takes about 5-7 days to arrive. By Registered 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.

 

Hongkong Post Air Mail/Parcel, track here: http://app3.hongkongpost.com/CGI/mt/enquiry.jsp

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

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.

 

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

 

3. The buyer return the goods to us and responsible for return shipping costs, after we receive your goods, we will send you a new product, and we will pay the cost for resend.

 

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