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Black Rotating Calcite Dichroscope Wtih StandNegotiableMOQ: 120 Pieces -
Fable Calcite Dichroscope For Obeserve Gem Multi Color CharacteristicsNegotiableMOQ: 1 Set
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High Quality Fable Calcite Dichroscope for Identifying Multi Color of the GemNegotiableMOQ: 1 Set
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Fable Jewels Stone DichroscopeNegotiableMOQ: 1 Unit
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Calcite DichroscopeNegotiableMOQ: 1 Unit
Specifications
Calcite Dichroscope*excellent iceland spar,
*black appearance
*big eyepiece,
*easy to observe the sharp images
Calcite Dichroscope with
1)excellent iceland spar,2)black appearance aviod refrecting interference;3)leather package.
It is the best instrument to distingush pleochromatism.Pleochroscope is most clear in the vertical direction,there is no pleochromatism in the horizontal direction,so we have to view from different direction.
The dichroscope is a pocket-sized tool that can aid in the identification of gemstones. With plenty of experience, one could even positively identify some gemstones with the dichroscope alone (although confirmation tests should always be carried out).
This tool is used to inspect pleochroism in gemstones and to quickly separate some common stones from each other (such as ruby versus red garnet).
The calcite dichroscope is the preferred type of dichroscope used in gemology. It works because the calcite rhomb (Iceland spar) separates the polarized slow and fast ray emerging from the gemstone. If you look at the viewing end of the dichroscope, two small windows are seen.
A gemstone is placed in front of the aperture (slightly touching it) with a strong white light source (such as a penlight) directly behind the stone. Light enters through the aperture of the dichroscope. The pleochroism colors inside the gemstone are separated by the calcite rhomb. The glass prisms on either side of the rhomb are there to guide the light straight through the instrument.
| Jewellery | Intensity of Pleochromatism | Color of Pleochromatism |
| Emerald | weak-medium | green-olivine |
| Red tourmaline | medium | red-pink |
| Green tourmaline | weak-medium | green |
| Ruby | medium | red/orange |
| Amethyst | weak-medium | fuchsia |
| Purple scapolite | meadium-strong | blue/light indigon |
| Bluesapphire | medium-strong | blue/green |
| Blue topaz | weak-medium | blue/achromatism |
| Acquamarine | medium-strong | blue/achromatism |
| Lolite | strong | light blue/purple |
| Blue apatite | weak-medium | blue/light blue |
| Green apatite | weak-medium | green/achromatism |
| Peridot | weak | green/light yellow |
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