![]() ![]() Sometimes a combination of the refractometer and another small instrument will help you to determine if the gemstone is a true synthetic. A diamond is too hard and would scratch the glass prism and should never be used on a refractometer, it has a reading over the limit and would not give a reading anyway.Ī refractometer will not distinguish between natural and synthetic gem materials and will not indicate if the gemstone has been treated. Some gemstones have readings that are out of the range of a refractometer, certain garnets will not have a reading on a refractometer. This is a common problem with gemstones set with large claws or prongs. If a gemstone is set in jewellery and the setting prevents the gemstone from resting with a surface that touches the glass prism on the refractometer, then a reading cannot be obtained. ![]() But gemstones that cannot have a good contact with the glass prism on the refractometer will not give a reading, perhaps their facets are too rough or scratched to make good contact. It is certainly an instrument that is diagnostic and can identify most gemstones. Some people think that if a person can use the refractometer and interpret the results then this is the only instrument that they need. Is the Refractometer the Only Instrument Needed in Gemmology? No! With the use of a chart of known refractive index readings we can identify most gemstones. Refractometer – The refractometer (using a refractive index liquid) will give readings that enable the gemmologist to identify most gemstones. ![]()
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