Microscopy: Determination & Quality Control of Gemstones
Gemmological microscopy examines the characteristic properties of stones, e.g. for quality controls (clarity, cut, carat)
All methods
Polariscopy: Identifying gemstone imitations
Polariscopy is applied to observe the optical properties of gemstones. It is used to identify imitations.
Dichroscopy: Reveal the direction-dependent polychromatism
Dichroscopes reveal whether transparent, coloured gemstones exhibit pleochroism, i.e. direction-dependent polychromatism.
Spectroscopy: Detect absorption spectra of gemstones
In gemological spectroscopy, absorption spectra of coloured stones can be generated and analyzed with reference spectra.
Refractometry: Determine optical characteristics of gemstones
Gemstone refractometers use the total reflection of polished stones to determine their refractive index. This determines the type of stone, characteristics and quality.
Examination with UV light
Some stones & synthetic substances show different forms of luminescence under UV light, which is used for the determination.
Testing and distinguishing gems
The Gemstone Tester separates real diamonds and gemstones from imitations & synthesis.
Use Ruby Filter & Chelsea Filter
Colour filters allow observations in special wavelengths. DaThis is valuable for distinguishing between gemstones and also a valuable tool in the assessment of gemstone lots.