| How to Use a Polariscope |
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| A polariscope is used to differentiate between singly (isotropic) and doubly refractive (anisotropic) stones. A stone is placed between two polarizing filters and the top filter is then turned. If used with a conoscope, interference figures can also be seen with a polariscope. (Conoscopes are difficult to explain on paper, so directions for use are not covered here. We suggest you consult http://www.gemologyproject.com. They have videos showing the use of the conoscope. ) | ||
| 1 | Turn on | 1 Attach power cord and plug in the polariscope. On/off switch
at the back of the polariscope. |
| 2 | Place stone | Gently place stone on removable lense. Some people prefer to use tweezers to hold the stone between the two filters. We find this requires 3 hands, and simply rest the stone on the removable lense. |
| 3 | Rotating Lense | Turn on polariscope. Look through the upper lense of the polariscope. Rotate removable lense exactly 1 full rotation. Count the number of times the stone blinks (or goes from light to dark.) That count is the refractivity of the gemstone. |
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| 1 | Flashlight | Put the flashlight into the opening under the polariscope and tighten the screw to hold the flashlight secure. |
| 2 | Assemble | Insert this removable lense into the polariscope with narrow end down. Turn on flashlight. |
| 3 | Place Stone | Gently place stone on removable lense. Some people prefer to use tweezers to hold the stone between the two filters. We find this requires 3 hands, and simply rest the stone on the removable lense. |
| 4 | Rotating Lense | Look through the upper lense of the polariscope. Rotate removable lense exactly 1 full rotation. Count the number of times the stone blinks (or goes from light to dark.) That count is the refractivity of the gemstone. |
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| While looking through the top lense, and rotating the stone if the stone: |
| -stays dark throughout a 360° rotation= isotropic (single refractive). |
| -blinks 4 times,2 light and 2 dark during a 360° rotation = anisotropic (double refractive). |
| -stays light throughout a 360° rotation =microcrystalline or cryptocrystalline aggregate |
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-twinkles instead of blinks = anomalous double refraction (ADR) and is really isotropic ADR is when a stone looks like it might be blinking, but really is just showing lighter where the stone is thinner or where there is a veil or weakness in the stone. Garnet and diamond sometimes display this phenomena. |
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Isotropic |
Anisotropic Zircon |
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| Shows if a stone is doubly or singly refractive using precision glass lens instead of plastic. Sturdy metal housing with diffused lighting. AC-powered long lasting LED light source. Includes conoscope and holder.
This item is covered by our one year warranty! -29.409- Click for more info. |
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| The PR Graduate Gem ID Kit ™ includes the essentials for gemologists who wants to identify gems and achieve certification in gemology and includes the well known OPL Pocket Spectroscope and PR Pro Refractometer. Purchasing this kit gives you are savings over 28% off regular pricing!:
Please see item pages for more details about each instrument. Not sure what all these tools do? We offer online tutorials here. Please consider purchasing one of the gemological identification books to help you learn to use your new tools. Sorry, no changes or substitutions can be made to gem kits. This item is covered by our one year warranty! Photo is of Study Kit, doesn't show OPL spectroscope or the PR Pro refractometer, new photo coming soon! -GemKitGrad-0909- Click for more info. |
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| The most popular guide to identifying gems and synthetics. Essential reading for collectors, dealers, and students to avoid mistakes and recognize opportunities. Authors: Antoinette Matlins and A.C. Bonanno Hardcover. 330 pages. -B0676- Click for more info. |
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