Refractometer is made of a metal case, polarizing filter on the top, glass hemicylinder and viewing lens at the bottom. Natural or white light is passed through the back of the unit.
Refractometer
A Refractometer can determine the type of mineral or gem by precisely measuring the stone's refractive index and comparing that number with the inherent refractive index of the mineral.
Refractometer" ...
REFRACTOMETER
A refractometer is a device that measures the refractive index of a gemstone.
REPOUSSE ...
Refractometer
An instrument used to measure the degree of refraction with a gemstone. One of the primary tests to identify gemstone material.
Rondelles
Small, jeweled or facetted beads often used as spacers in a string.
Refractometer
Apparatus used to measure the refractive indices of gems.
Replacement Value ...
[A refractometer that is ready to take a reading]
In the picture above, a light source is in position, the recently cleaned gem is table down on the hemicyclinder with a drop of contact fluid in place.
Refractometer...Instrument used to determine the refractive index of various substances.
Rock...Stoney matter. Any mass of mineral matter forming an essential part of the earth's crust.
Sclerometer...Device for the quantitative measuring of hardness.
The Herbert-Smith Refractometer. There is on the market an instrument called the Herbert-Smith refractometer, by means of which anyone with a little practice can read at once on the scale within the instrument the refractive index, as it is called, ...
The refractive indices of gems are measured with a refractometer. Gems can be identified by measuring their refractive indices(plural) refractometer Instrument that measures the refraction of light when it enters through a different dimension, ...
00:40, 11 January 2008 (hist) (diff) N Refractometer (New page: A gemological instrument which works on the principal of total internal reflection and which is used to measure the refractive index of gemstones.) ...
light, long and short wave ultraviolet light, GIA certified diamond color master set, GIA gem set, GemDialogue, cultured pearl master set, fiber optic lighting, dichroscope, spectroscope, polariscope with interference figure sphere, refractometer, ...
All mentioned substances can be measured on the Refractometer, as long as their refractive index is below 1.81.
Another required tool for gemologists is the refractometer. A small drop of liquid with a high refractive index (RI) is placed on a glass cylinder in the top of the refractometer and illuminated from a separate light source (sometimes white light, ...
A process developed by Willebrord Snell that incorporates a refractometer to measure the speed and angle of light as it enters a gemstone. It is used in gem identification.
Rose Cut
An age old art of faceting a stone to look like an opening rose.
Refractive Index A process using a refractometer to measure the speed and angle of light entering a gemstone. Very important for gem identification.
Refractive index: Developed by Willebrord Snell in the seventeenth century. This process usually incorporates a refractometer, which measures the speed and angle of light as it enters a gemstone.
From diamond and c.z. with a polariscope, and by marked birefringence (doubling of pavilion facets).
From most others by high R.I. (off scale of refractometer)
Inclusions (rutile, Fe-oxides) characteristic, as is color zoning
Sources ...
Refractive Index The amount of refraction defined as the proportional relationship between the speed of light in air to that of the gemstone, crystal, or gem rough. Can be determined by a refractometer ...
This can be easily determined by asking if they have received any formal gemology training. As visual inspection is not a reliable means of identifying gemstones, please make sure you ask what tools (e.g., refractometer, jeweler’s loupe, etc.) ...
 See also: Color, Stone, Natural, Gemstone, Crystal
  
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