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Help CenterJewelry Refractometer for Gem Testing
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Specifications
jewelry refractometer for gem testingTesting range: 1.35-1.85.
High hardness CZ (cubic zirconia) testing table
built in light
A Gem Refractometer measures the refractive index of your gems. Besides the RI, a refractometer will also give you the birefringence and optic sign. When possible, it is easier to obtain the optic sign from a polariscope. However, that can’t always be done, so you need the refractometer as an alternate means to determine the optic sign when necessary.
As the refractive index of the gemstones are fixed, the RI value becomes a very important reference data; naturally, a Gem Refractometer is absolutely essential for gem identification.
function :
Hard CZ measuring prism.
Scale range:1.35-1.85.Accuracy: ±0.003
Professional optical design, Aluminum alloy table and Internally installed the monochromatic light.
There are two ways of inputing the voltage:7 AA batteries and DC3V direct current suply(AC100—240V).
2ml refringent oil(1.78±0.005) with unique design of the bottle(Proprietary technology ZL200620096730.7),
It is much safer ,much ecnomical and more convinent.
refractive index of the gemstones
| name | R.I. | birefringence | name | R.I. | birefringence |
| Opal | 1.42-1.45 | Apatite | 1.634-1.638 | 0.004 | |
| Fluorite | 1.45 | Peridot | 1.654-1.695 | 0.035 | |
| Glass | 1.51-1.82 | Jadeite | 1.66± | ||
| Sodalite | 1.483-1.487 | Diopside | 1.675-1.701 | 0.026 | |
| Lapis lazuli | 1.50 or 1.67 | Syn.spinel | 1.728± | ||
| Moonstone | 1.52-1.54 | Chrysoberyl | 1.746-1.755 | 0.01 | |
| Chalcedony | 1.53-1.54 | Hydrogrossular | 1.730-1.740 | ||
| Lolite | 1.544-1.553 | 0.01 | rundum | 1.762-1.770 | 0.008 |
| Crystal | 1.544-1.553 | 0.009 | Almandite | 1.79±0.03 | |
| Beryl | 1.56-1.59 | 0.008 | Ruby&Sapphire | 1.762-1.770 | 0.008 |
| Turquoise | 1.61-1.65 | Zircon | 1.925-1.984 | 0.059 | |
| Nephrite | 1.61± | CZ | 2.08-2.20 | ||
| Topaz | 1.61-1.640 | 0.009 | Strontium titanate | 2.409 | |
| Tourmaline | 1.620-1.644 | 0.02 | Diamond | 2.417 | |
| Anslusite | 1.634-1.643 | 0.01 | Spinel | 1.718-1.785 | |
| Obsidian | 1.50± |
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