GJG-91 Jadeite filter

SKU: GJG-91
Vendor: AMZ Instruments
Product Type: gem instruments
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Top Optics Manufacturer & Exporter

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Ningbo AMZ Instruments Co., ltd.

As a top optics product manufacturer, AMZ INSTRUMENTS provides a broad range of cutting-edge professional optics and accessories to large distributors around the global.

Through our China network of manufacturing facilities we are able to manufacture superior instruments and optical components to our specifications at reasonable prices. To ensure the best in quality and performance we visit, inspect and audit each of our manufacturing partners on a regular basis.

Our products are available exclusively through a nationwide network of authorized distributors and are backed by our industry leading 2-year limited warranty.

Global Shipping

1. Courier shipping by FedEx, UPS, DHL, Estimated to be delivered Around 5-7days.

2. Air shipping, Estimated to be delivered Around 5-7days.

3. Sea shipping, Estimated to be delivered Around 25-40days.

Shipping Information

We can ship to virtually any address in the world. please email us at info@amz-instruments.com or call +86 15990266988 to get a quote that includes shipment fees.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Shipment fees are calculated based on the destination, size and weight of your item(s) and include insurance of the goods shipped. Our standard shipment method is Fed Ex, UPS. If you have your own UPS or Fed Ex, DHL account #, we are happy to ship on your account. Please emial or call us to place your order and provide us your account information.

 Why Choose Us?

AMZINST manufactures optics products and related accessories, which have been consistently distributed and trusted by worldwide companies.

China-owned and operated facilities provide the management, quality control, design, marketing and customer service that make AMZINST® a market leader. In our China warehouse, each product is unpacked, assembled and individually tested and inspected by our team of technicians to ensure compliance with the strict quality standards. Join our network of distributors for a mutually beneficial partnership.

Product Description

This gemmological tool is helpful for identifying certain red, blue and green gemstones. It is used to determine whether a gemstone is natural or synthetic and can also be used for detecting Synthetic Blue Spinel as well as for detecting dyes in certain gemstones. The ChelseaFilter is a popular Gemmological Dichromatic Filter that was originally devised by Anderson and Payne in 1934 at the Gem Testing Laboratory of the London Chamber of Commerce.

The filter was devised with the collaboration of gemmology students of the Chelsea College of Science and Technology. As this filter allowed transmission of both deep red wavelengths around 690 nm and yellow-green wavelengths, around 570 nm, that matched an Emerald's emission and absorption characteristics, it was initially recommended to assist the discrimination between natural emerald and its simulants such as Green Glass, Tourmaline, Peridot, etc.

This discrimination was possible because Chromium - containing Iron - and Vanadium-Free Emeralds emitted a red fluorescence when illuminated by white light that had a content of ultraviolet wavelengths. Synthetic Emeralds were commercially introduced around 1940. These produced the same pink-red response as some emeralds through the Chelsea Filter.

However, although this filter was unable to predictably discriminate between Natural and Synthetic Emerald, it was subsequently found capable of distinguishing Aquamarine, Blue Topaz and their blue Synthetic Spinel simulants, for unlike natural gemstones, blue Cobalt-Containing Synthetic Spinels emitted a red fluorescence under white light.

Hold the filter an inch or two from the eye. Light the stone with a strong light bulb or torch. The stone may appear to change colour.

The filter must be held near the eye but there is no need to hold the filter close to the stone; even items in showcases can be examined providing they are lit by strong lights.

 

Specification:
● Name: Jadeite filter
● Dimension: 46.1x26.1mm
● Package: by leather box & white box

 

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