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Gemology - Quiz
Contributed by: Bedford
  • 1. Gemology is the study of precious and semi-precious gemstones, including their characteristics, properties, identification, and value. Gemologists analyze gems to determine their chemical composition, structure, and rarity. They also assess gems for quality and authenticity, often using tools such as microscopes and refractometers. Gemologists play a crucial role in the jewelry industry, helping to certify and appraise gemstones for use in jewelry and other decorative items. Their expertise is highly sought after by gem traders, jewelers, collectors, and consumers seeking to better understand and appreciate the beauty and value of gemstones.

    What is the hardest naturally occurring substance on Earth?
A) Topaz
B) Amethyst
C) Diamond
D) Sapphire
  • 2. What is the birthstone for January?
A) Emerald
B) Garnet
C) Turquoise
D) Amethyst
  • 3. What type of gemstone is a ruby?
A) Corundum
B) Beryl
C) Feldspar
D) Quartz
  • 4. Which gemstone is known to exhibit a phenomenon called asterism?
A) Ruby
B) Star Sapphire
C) Emerald
D) Topaz
  • 5. Which gemstone is associated with the zodiac sign Libra?
A) Peridot
B) Opal
C) Emerald
D) Sapphire
  • 6. What causes the color in most amethyst gemstones?
A) Iron impurities
B) Manganese impurities
C) Titanium impurities
D) Copper impurities
  • 7. What is the rarest and most valuable form of jade?
A) Jadeite Jade
B) Nephrite Jade
C) Imperial Jade
D) Black Jade
  • 8. What is the primary coloring agent in turquoise gemstones?
A) Manganese
B) Iron
C) Zinc
D) Copper
  • 9. What is the rarest variety of garnet?
A) Demantoid
B) Spessartite
C) Rhodolite
D) Almandine
  • 10. What is gemology?
A) A financial study related to the trading of gemstones.
B) An art form focused on creating jewelry from gems.
C) A branch of biology that studies gems.
D) The science dealing with natural and artificial gemstone materials.
  • 11. Which organization was established as an Education Committee in 1908?
A) American Gem Society.
B) GIA.
C) Gemmological Association of Great Britain.
D) The National Association of Goldsmiths of Great Britain (NAG).
  • 12. In what year was the first gemological laboratory serving the jewelry trade established in London?
A) 1931.
B) 1925.
C) 1947.
D) 1908.
  • 13. Who was the first US graduate of Gem-A's diploma course?
A) GIA founder.
B) A member of NAG.
C) Founder of American Gem Society.
D) Robert Shipley.
  • 14. What prompted the establishment of the first gemological laboratory in London?
A) Demand for diamond certification.
B) The influx of newly developed 'cultured pearl' and advances in synthesis of rubies and sapphires.
C) Need for jewelry appraisal services.
D) Development of the Mohs scale.
  • 15. What is a major factor in valuing a gemstone?
A) The size of the gemstone.
B) The weight of the gemstone.
C) Understanding its atomic structure and identifying its origin.
D) The color intensity alone.
  • 16. What does a gemologist study when valuing or appraising cut and polished gemstones?
A) Factors like crystal structure, specific gravity, refractive index, and other optical properties.
B) Only the color of the gemstone.
C) The market demand for that type of gemstone.
D) The historical significance of the gemstone.
  • 17. What can reveal whether a gem is synthetic or natural?
A) Gemological microscopic study of the internal structure, showing natural fluid inclusions or partially melted exogenous crystals.
B) The weight of the gemstone.
C) The market value.
D) The color intensity alone.
  • 18. Which instrument can help identify the presence of structural imperfections in a gemstone?
A) Stone cloth
B) Penlight
C) Microscope
D) Color filter
  • 19. Which gemological instrument is used to observe pleochroism in a gemstone?
A) Spectroscope
B) Refractometer
C) Polariscope
D) Dichroscope
  • 20. Which process is associated with the formation of curved striations in synthetic gems?
A) Refractive index measurement.
B) Spectroscopy analysis.
C) Specific gravity testing.
D) The Verneuil process.
  • 21. Which instrument is used to observe fluorescence under ultraviolet light?
A) Ultraviolet lamp
B) FTIR spectrometer
C) Polariscope
D) Refractometer
  • 22. Which instrument is used to analyze the elemental composition of a gemstone?
A) EDXRF spectrometer
B) Refractometer
C) Polariscope
D) FTIR spectrometer
  • 23. What is the name of a publication associated with Italian gemology?
A) Gems & Gemology.
B) Gemology Frontier.
C) The Journal of Gemmology.
D) IGR – Rivista Italiana di Gemmologia.
  • 24. How do natural beryl minerals typically differ from synthetic ones?
A) They show small flaws where the crystalline orientation changes abruptly.
B) They have curved striations.
C) They lack any internal structures.
D) They are amorphous like glass.
  • 25. What does a spectroscopic analysis of cut gemstones allow a gemologist to do?
A) Measure the size of the gemstone.
B) Understand the atomic structure and identify its origin.
C) Determine the age of the gemstone.
D) Identify the weight of the gemstone.
  • 26. What is the significance of a ruby from Myanmar compared to one from Thailand?
A) Thai rubies are more valuable.
B) Myanmar rubies are always larger.
C) They are identical in value.
D) It will have definite internal and optical activity variance.
  • 27. Which instrument is used to observe the optic figure of a gemstone?
A) Dichroscope
B) Optic figure sphere
C) Contact liquid for RI
D) Penlight
  • 28. What is the purpose of mobile laboratories used by professional gemologists?
A) To clean and polish gemstones.
B) To display gemstones to potential buyers.
C) To store gemstones safely during transport.
D) To perform analysis and estimation on site, independent from infrastructure.
  • 29. Which instrument is used to measure the Raman spectrum of a gemstone?
A) Polariscope
B) Raman spectrometer
C) Refractometer
D) Spectroscope
  • 30. What is the physical property of 'hardness' defined by?
A) The color intensity of the gemstone.
B) The market demand for that type of gemstone.
C) The weight of the gemstone.
D) The irregular Mohs scale of mineral hardness.
  • 31. What is a significant challenge for modern gem laboratories?
A) Identifying treatments to gems, new synthetics, and other new materials.
B) Maintaining traditional gem cutting techniques.
C) Training enough gemologists.
D) Finding enough raw gemstones.
  • 32. How are gemstones categorized?
A) By their market value.
B) By the country of origin.
C) According to their color alone.
D) Based on their crystal structure, specific gravity, refractive index, and other optical properties.
  • 33. Which instrument is used to measure the photoluminescence properties of a gemstone?
A) Photoluminescence spectroscopy system
B) Ultraviolet lamp
C) EDXRF spectrometer
D) Raman spectrometer
  • 34. Which instrument is used to observe the spectral properties of a gemstone?
A) Polariscope
B) Dichroscope
C) Spectroscope
D) Refractometer
  • 35. What does the term 'cultured pearl' refer to?
A) A newly developed type of pearl that prompted the establishment of the first gemological laboratory in London.
B) A natural pearl found in oysters.
C) An ancient method of polishing pearls.
D) A synthetic diamond.
  • 36. What is the specific gravity range for cubic zirconia?
A) 1.81
B) 4.00
C) 3.15–4.20
D) 5.6–5.9
  • 37. What is the role of chromophores in gem identification?
A) They show bands indicating which element colors the gem.
B) They identify curved striations.
C) They measure refractive index.
D) They determine the specific gravity.
  • 38. Which gemological instrument is used to measure the refractive index (RI) of a gemstone?
A) Refractometer
B) Spectroscope
C) Polariscope
D) FTIR spectrometer
  • 39. What does the critical angle in gemology refer to?
A) The angle at which a gemstone absorbs the most light.
B) The angle at which a gemstone fractures.
C) The angle above which light is reflected back internally within a gem.
D) The angle at which a gemstone shows its cleavage planes.
  • 40. What is pleochroism?
A) A type of gemstone treatment.
B) A method of cutting gemstones.
C) An optical property used in categorizing gemstones.
D) A scale for measuring gemstone hardness.
  • 41. When studying rough gemstones, what does a gemologist initially identify by?
A) Market value and demand.
B) The size and weight of the stone.
C) Color, refractive index, optical character, specific gravity, and examination of internal characteristics under magnification.
D) The historical significance of the gemstone.
  • 42. Which instrument is used to identify the optical activity of a gemstone?
A) Refractometer
B) Polariscope
C) Spectroscope
D) Dichroscope
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