Dichroscope, tube Fixed magnification - multi-magnification You want the largest lens

You want the largest lens

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be used as a diamond tester

can test different cuts (shapes) not just round

See a large selection of small stand magnifiers

Dichroscope, tube Fixed magnification - multi-magnification You want the largest lensSummary A tube 50mm long X 12mm dia. If a stone is dichroic (transmits two colours at once) you will see the two distinct colours when viewed through a dichroscope. You can see the two colours by viewing the stone from different directions, but this often impossible if the stone is set in jewellery, it's easier to use a dichroscope. Is it easy to use? Yes. Limitations & Disclaimer For coloured stones only. This is a standard gem tester used by