Chelsea Filter is designed to transmit only deep red and yellow - green light (best obtained under strong electric light). Just hold the filter close to your eye and look at the stones. Multiple stones can be viewed at once. It is helpful with identifying a few red gems and certain blue and green stones. Chelsea Filter can filter out mixed - in jewellery and differentiate emerald from emerald lookalikes. It is also useful for checking aquamarine and sapphires.
With the filter, emeralds usually appear distinctly red or pinkish in colour, while most imitations remain green. In rare cases certain emeralds, most notably from South Africa, may not show any pinkish colour at all. A synthetic emerald will react the same as a genuine one
Rubies (both genuine and synthetic) appear brilliant red under the filter. Synthetic blue spinel appear yellow - orange or pink while aquamarine and sapphires appear green or green - grey
This Chelsea colour filter has a glass filter. This gives better clarity, reduces distortion and provides better protection from humidity
The Chelsea Filter is a combination of two gelatine filters that transmit only deep red and yellow/green light. As Emeralds transmit light in the deep red spectrum but absorb light in the yellow/green spectrum, this combination is the most practical. It is a useful tool to distinguish natural emerald and natural green beryl, as well as most green and blue gems.
Whether you are a professional jeweller or a naturally curious amateur, use Chelsea identification filter to find out the true nature of gemstones!
Features:
* Accurately distinguish the real nature of the gemstones in an instant
* Supplied with leather pouch case
* Manufactured to strict quality and safety standards for long and trouble-free life
* Guaranteed high quality and accurate testing results
Specifications: * Filter Diameter: 20mm * Filter material: Glass * Body: Made of metal
How to use the Chelsea Filter
Just hold the Chelsea Filter close to your eye, place your green (or blue) gems under a strong electric light. There is no need to hold the filter close to a stone, even items in showcases can be examined providing they are lit by strong lights
The results are as follows
Type of Stone or Gemstone Colour Shown through Filter or Apparent Color
Natural Emeralds Pinkish - Red Synthetic Emeralds More intense Red Emerald Simulants Green Synthetic Green Spinel Green Peridot Green Green Sapphire> Green Green Tourmaline Green Chrome Green Tourmaline Red or Pink Demantoid Garnet andGreen Zircon Red but with a negative reading
on the refractometer since no total
internal reflection occurs Aquamarine, Blue Topaz and Zircon Green Lapis Lazuli Weak Brownish Red Cobalt Glass Deep Red Natural Blue Spinel Red Synthetic Dark Blue Spinel Red Natural Cobalt Blue Spinel Red Synthetic Light Blue Spinel Pink - Orange Blue Sapphire Dark Green (almost Black) Blue-Purple Color Change Sapphire Usually appears Red Most treated Jade Reddish Natural Jade Green
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