Standard Gemological Instruments and their use

 

Gemological Instruments and their use

S#	Name of Instrument	Use
1	Polariscope	Polariscope is useful instrument to determine whether the stone is singly refractive (SR) or Double refractive (DR)
2	Refractometer(portable)	Refractometer is use for Refractive index (RI) of gemstone.
3	Dichroscope (portable)	Dichroscope is use for Pleochroism in gemstones. If the gemstone is pleochroic then it should be Double refractive.
4	Spectroscope(portable)	Spectroscope is use for to determine the spectrum of gemstones. With the help of spectroscope we can easily separate same colors gemstones for example ruby, red glass and garnet.
5	Ultraviolet Lamp (portable)	Ultraviolet is use for to determine Fluorescence effect in gemstones. With the help of this instrument we can separate natural blue sapphire from synthetic blue sapphire.
6	Chelsea filter (portable)	Chelsea filter is use for separating emerald from its imitations and detecting chromium in green stones and cobalt in blue stones.
7	Microscope  / Hand lens(portable)	Use for study of inclusions in gemstones. It is one of the most powerful tool in ordinary gemology tools.