Gemology Gem Identification Techniques

Question 1

Which instrument is most commonly used to measure the refractive index of a gemstone?

Accepted Answer

Refractometer

Answer

Spectroscope

Answer

Polariscope

Answer

Loupe

Question 2

What optical effect is observed in gemstones like star sapphires?

Accepted Answer

Asterism

Answer

Pleochroism

Answer

Chatoyancy

Answer

Birefringence

Question 3

Which test helps determine if a gemstone is singly or doubly refractive?

Accepted Answer

Polariscope

Answer

Refractometer

Answer

Microscope

Answer

Spectroscope

Question 4

Which instrument allows a gemologist to see internal inclusions within a gemstone?

Accepted Answer

Microscope

Answer

Dichroscope

Answer

Loupe

Answer

Chelsea filter

Question 5

What is the purpose of using a Chelsea filter in gem identification?

Accepted Answer

To identify synthetic or treated stones

Answer

To test hardness

Answer

To measure density

Answer

To view inclusions

Question 6

Which property does a spectroscope reveal in a gemstone?

Accepted Answer

Absorption spectrum

Answer

Refractive index

Answer

Internal structure

Answer

Pleochroism