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2. Refractometer - Wikipedia

   en.wikipedia.org/wiki/Refractometer

   The refractometer is used to help identify gem materials by measuring their refractive index, one of the principal properties used in determining the type of a gemstone. Due to the dependence of the refractive index on the wavelength of the light used ( i.e. dispersion ), the measurement is normally taken at the wavelength of the sodium line D ...

3. Gemology - Wikipedia

   en.wikipedia.org/wiki/Gemology

   Traditional handheld refractometer. One test to determine the gem's identity is to measure the refraction of light in the gem. Essentially, when light passes from one medium to another, it bends. Blue light bends more than red light. How much the light bends will vary depending on the gem mineral.

4. Refractometry - Wikipedia

   en.wikipedia.org/wiki/Refractometry

   A refractometer is the instrument used to measure refractive index ("RI"). Although refractometers are best known for measuring liquids, they are also used to measure gases and solids, such as glass and gemstones.

5. Gem hunter discovers rare rubies worth $530,000 in marketplace

   www.aol.com/news/2014-03-20-gem-hunter-discovers...

   Experienced gem hunter Don Kogen, head of Gem Guys Inc., is following a lead that newly discovered sunset rubies are coming out of the ground in southeast Asia. Using his network of contacts in ...

6. Digital handheld refractometer - Wikipedia

   en.wikipedia.org/wiki/Digital_handheld_refractometer

   A digital handheld refractometer is an instrument for measuring the refractive index of materials. Principle of operation Most ...

7. Watch the 10 Most Expensive Super Bowl Commercials Ever Made

   www.aol.com/watch-10-most-expensive-super...

   YouTube/Super Bowl Commercials. Watch it here. Cost: $15.6 million. Length: 90 seconds. Year: 2019. The post Watch the 10 Most Expensive Super Bowl Commercials Ever Made appeared first on Wealth Gang.

8. Traditional handheld refractometer - Wikipedia

   en.wikipedia.org/wiki/Traditional_handheld...

   A traditional handheld refractometer is an analog instrument for measuring a liquid's refractive index. It works on the critical angle principle by which lenses and prisms project a shadow line onto a small glass reticle inside the instrument, which is then viewed by the user through a magnifying eyepiece.

9. Abbe refractometer - Wikipedia

   en.wikipedia.org/wiki/Abbe_refractometer

   In the Abbe refractometer the liquid sample is sandwiched into a thin layer between an illuminating prism and a refracting prism. The refracting prism is made of a glass with a high refractive index (e.g., 1.75) and the refractometer is designed to be used with samples having a refractive index smaller than that of the refracting prism.