Refractometer
Refractometer
Refractometer
Refractometer
Refractometer
Refractometer
  • Load image into Gallery viewer, Refractometer
  • Load image into Gallery viewer, Refractometer
  • Load image into Gallery viewer, Refractometer
  • Load image into Gallery viewer, Refractometer
  • Load image into Gallery viewer, Refractometer
  • Load image into Gallery viewer, Refractometer

Refractometer

Feefo logo
Vendor

Ref: REFRACT-L

Regular price
£195.00
Sale price
£195.00
Regular price
Out of stock
Unit price
per 
inclusive of VAT. Shipping calculated at checkout.
Ask a question about this product

Pickup available from Quicktest (WD18 8PH)
Email us or call on 01923-220206 for appointment.

Summary

For the gemmologist the refractometer is the most important gem tester after a loupe. It measures refractive index (to what extent light is bent as it passes through the gemstone).

This product is intended for gemmologists (or those about to study gemmology) - instructions are not included.

 

Detail

Approx. 5 X 3 X 2 inches.

Range: 1.30 to 1.81

Possible error in readings: +/- 0.01

Test plate made of high-refractive glass

Power: Takes 3 size LR44 batteries (included).

2ml of contact fluid is included, just to get you started, but you will eventually need to buy a full bottle (10ml).

 

Is it easy to use?

BASIC OPERATION: Rest the flat polished surface of the stone on the test plate, and through the viewfinder you see a scale, part of which will be light and part of which will be dark. In between the light and dark is the 'shadow edge' that marks a reading on a scale. It's a little slow and fiddly but not too difficult to master.

ADVANCED OPERATION: Not only do you get a reading, but often you will see two shadow edges, indicating a doubly refractive stone (which, itself, is diagnostic), AND advanced users can glean further information by rotating the stone to see if either or both of the shadow edges move, and by taking minimum and maximum readings for each.

 

 

Limitations

Although this is an 'easy' test because you end up with a number, and you look up the number on standard charts, you will soon discover that (as with all gem testers) there are many gemstones with the same (or overlapping) readings. A refractometer will help you narrow the possibilities to a handful (maybe one or two) stones, but it will not give an instant 100% guaranteed answer.

Some stones are out of range for this machine (their refractive index is too high to be measured) including some garnets, diamonds and most diamond simulants including zircon and sphene. This cannot, therefore, be used as a diamond tester.

 

QUESTIONS & ANSWERS

Have a Question?

Be the first to ask a question about this.

Ask a Question