Standard diffraction grating design, a tube 50mm long X 12mm dia.

What is detects: absorption spectra. How to use: view the colour of a gemstone, either by shining a light (pen-torch) through the stone into the spectroscope if the stone is transparent, or by viewing its reflected light if the stone is opaque.

What you see: a spectrum (rainbow) which might be interrupted with black or white lines, it is the pattern of these lines you must learn to recognise.

For the gemmologist: best at detecting iron and chromium.

For the non-gemmolgist: the 'diamond simulants' YAG and Cubic Zirconia give spectacular spectra and so too does some Zircon. Other gemstones are more difficult to detect.

Instructions are NOT included with this item, it is assumed that you are either a gemmologist (or a student) or that you will be using a book about gemmology...see optional extra.

Short prism spectroscope, 70mm long X 14mm diameter. This one has the clearest easy-to-view spectrum.

Full-size prism spectroscope, 130mm long, X 20mm diameter.

One only (it's a sample I got from a factory in China).

Many stones appear to change colour when viewed through the filter. Originally designed for detecting synthetic emeralds, nowadays the Chelsea filter is an invaluable aid to identifying many other gemstones.

To read the instructions manual click here and decide for yourself if this is the most valuable tester a dealer could have...or far too complicated to understand!


People who bought this item also bought:

1. Quicktest-3 Gold / Silver Tester (3-bottle set) (Ref: Q3)

This is THE standard tester for gem testing. It is optical (not electronic), you see a shadow on a scale, read the number, then look it up on standard charts. Can be used with any gemstone that has a flat polished surface, whether loose or set in jewellery (click MORE to see a picture of testing a mounted stone). Note: will not test for diamond.

Supplied in a sturdy box (easily portable) complete with a bottle of refractometer fluid.

Instructions are NOT included with this item, it is assumed that you are either a gemmologist (or a student) or that you will be using a book about gemmology.

The Item: A tube 80mm tall X 30mm dia.

What it detects: double refraction.

How to use: At the top and bottom of the tube are two filters (Polaroid discs), revolve the top filter until everything in the tube appears dark and place the stone on the platform in the middle (if mounted, you might have to fix the item upright with a spot of blu-tac so that you can see the stone). Now turn the platform so that the stone revolves through 360°.

What you see: If the stone appears to turn light-and-dark it is doubly refractive, if it remains dark it is singly refractive.

For the gemmologist: all crystalline gemstones except for those of the Cubic System are doubly refractive.

For the non-gemmolgist: Moissanite is strongly doubly refractive, diamond is singly refractive. This is, therefore, a very simple and effective method of distinguishing diamond from Moissanite. Instructions: not included.

Mains-powered polariscope.

Brilliant-cut cubic zirconia, 5mm diameter (measures about 30 points on a diamond gauge).

TRADE DESCRIPTION:

As an expert, YOU can probably tell Cz from diamond at a glance. But to your customers, Cz will look identical to diamond. And your customer will be impressed when you show them how easily you can distinguish between the two with your tester.



For 'public' description click here
People who bought this item also bought:

1. Gem-n-Eye Electronic Gem Tester (Ref: reflect)

2. Set of Sample Diamond Imitations (Ref: test-stones)