$Refractometer$

$Refractometer$

Principle of a refractometer

How to use a refractometer

$Principle of a refractometer; A refractometer measures sthe refraction index of a gem.$

$How to use a refractometer$

$Viewing a refractive index in a refractometer$

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$Refractive index analysis, what you see when your gem in Uniaxial$

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$Refractive index analysis U+$

Viewing a refractive index in a refractometer

$Refractive index analysis U-$

Refractive index analysis

$Refractive index analysis B-$

Refractive index analysis

Spot method

$Refractive index analysis B- or B+$

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Limitation of the refractive index analysis

$Refractive index analysis B+$

$How to measure Refractive index analysis when the gem does not have a flat facet$

$Limitation of the refractive index analysis, need a polished non porous surface. refractometer is limited to value between 1.30 and 1.81$

$Refractometer$