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