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| 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. -29.409- Click for more info. |
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| The Graduate Gem ID Kit ™ includes the essentials and the extras for studying gemology. Perfect for gemologists who want to identify gems and achieve certification:
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. -GemKitGrad- 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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| The GemOro precision, high-quality 10x Hastings Triplet Loupes have superior Hoya Japanese optics, three bonded aplanatic and achromatic color corrected lenses, inside a sturdy hexagonal casing combined with a tactile no-slip rubber grip for easy handling. A slip ring is included on cross bar to attach loupe to necklace, key ring or pocket chain. This model comes in an eye catching Pink Marble colored case. -SK-0466G- Click for more info. |
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