Description:
- The chelsea Filter is a helpful tool in distinguishing a few red and certain blue & green gemstones, even identifyingthem from paste (brilliant lead glass) or synthetic gems since gemstones  will appear to change cour when viewed with this. It works by allowing only certain wavelenghts of yellow-green and red colors (around both 690 nanometer(nn) and 570nn) to be transmitted through the filter.
Features:
- Accurately distuinguish the real nature of the gems in an instant
- Detects the presence of Chromium and Cobalt (normally indicates the coloring elements present in certain gems)
- Generally useful for green and blue stones
- In some cases it may help detect dye in certain stones
- Supplied with leather pouch case
- Approved by strict quality and safety standards for long and trouble-free life
- Guaranteed high quality and accurate testing results
- Brand new and unused
Specifications:
- Filter material: glass
- Filter Diameter: 20mm
- Body: Made of metal
- Swing away metal case
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