Table of Contents
- 1 What does a gem refractometer do?
- 2 What is a Polariscope used for?
- 3 What is a gem material?
- 4 How do you make a polariscope?
- 5 What is Photoelasticity explain?
- 6 What qualifies as a gem?
- 7 What is a gemological refractometer?
- 8 Where can I find information on Krüss gem refractometers?
- 9 How do you use a refractometer with refractive index?
What does a gem refractometer do?
The primary use of the refractometer is to measure the angle at which light traveling through the stone is bent or refracted. This is called Refractive Index (R.I.). Gemological refractometer also can be used to determine whether or not a stone is single or double refracting.
What is a Polariscope used for?
The polariscope is an optical inspection device used to detect internal stresses in glass and other transparent materials such as plastics, synthetic resins, etc. A polariscope is composed chiefly of a light source and two crossed polarized lenses such as Polaroid {{Registered Trademark}}.
What is a gem material?
A gem, or gemstone, is a type of material that is capable of being cut and polished for use in jewelry or other ornamental applications. Gems are most commonly made of minerals. Minerals, as you might already know, are naturally occurring, inorganic, crystalline solids, of definite chemical composition.
What is refractometer liquid?
The Cargille Gem Refractometer Liquid has a refractive index of nD = 1.810, the highest of any liquid not containing arsenic. This light yellow liquid can also be used to reduce or eliminate glare from a gem’s surface, facilitating inspection of the gem’s interior for inclusions and other defects.
What gemstone has the highest refractive index?
What makes moissanite more brilliant than other gems?
| Gemstone | Refraction Index |
|---|---|
| Moissanite | 2.65 – 2.69 |
| Diamond | 2.41 – 2.42 |
| Ruby | 1.76 – 1.77 |
| Sapphire | 1.76 – 1.77 |
How do you make a polariscope?
Build your own portable polariscope
- Find the leads that power the screen backlight.
- 3-5 volts are required.
- Cut the polarizer off an old cell phone, laptop or LCD display.
- Place a polarizing film above the magnifier and the cell phone screen below the lens.
- System is powered.
What is Photoelasticity explain?
Photoelasticity describes changes in the optical properties of a material under mechanical deformation. It is a property of all dielectric media and is often used to experimentally determine the stress distribution in a material, where it gives a picture of stress distributions around discontinuities in materials.
What qualifies as a gem?
What Makes A Mineral A Gemstone? Most are minerals and are cut from naturally occurring crystals. To qualify as a gem, the specimen should be hard and tough to resist scratching and have beautiful clarity, colour or ‘fire’. Value is based on rarity and rare quality.
What is example of gemstone?
These are beryl, chrysoberyl, corundum, diamond, feldspar, garnet, jade, lazurite, olivine, opal, quartz, spinel, topaz, tourmaline, turquoise, and zircon. Some of these minerals provide more than one type of gem; beryl, for example, provides emeralds and aquamarines, while corundum provides rubies and sapphires.
What is gem refractometer liquid?
The Cargille Gem Refractometer Liquid has a refractive index of nD = 1.810, the highest of any liquid not containing arsenic. It is widely used with gem refractometers as a contact medium for the identification of gemstones.
What is a gemological refractometer?
A Gemological Refractometer is your primary and most powerful tool in gemstone identification. As with any typical critical angle refractometer, it will measure the Refractive Index of faceted stones , transparent to near opaque, whether loose or mounted (in many cases), up to an R. I. value of 1.81 .
Where can I find information on Krüss gem refractometers?
All Krüss gem refractometer models are constructed of cast aluminium, and are supplied complete with a polarisation filter and manual. For prices and availability information on Gem Refractometers, please contact your nearest Krüss distributor, who will be delighted to help. You can find our Gemstone Refractometers in the Gemmo-Shop.
How do you use a refractometer with refractive index?
Your refractometer kit also includes a bottle of Refractive Index Liquid with a matching R.I. value of 1.81. To use the refractometer, open the lid, then place a small amount of R.I. fluid on the refractometer’s measuring glass using the bottle’s built-in dropper.
How to tell if a gemstone is doubly refractive?
If the gemstone is doubly refractive, best seen by rotating the polarizing filter as you view the scale, you will see two shadow lines, the numerical difference between them equating to that stone’s birefringence.