Exam Questions And Correct Answers

Gemological Institute of America (GIA) Graduate Jeweler Certification Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the most commonly used metal for fine jewelry settings?
• Titanium
• Gold
• Copper
• Nickel

Rationale: Gold is the most commonly used metal in fine jewelry due

to its malleability, resistance to tarnish, and traditional value.

• Which karat gold is considered pure gold?

A. 18K

B. 20K

C. 24K 1 / 4

D. 22K

Rationale: 24K gold contains 99.9% pure gold, with no significant

alloy metals added.

• What is the Mohs hardness of diamond?
• 8
• 9
• 10
• 7

Rationale: Diamond ranks 10 on the Mohs scale, making it the

hardest known natural material.

• Which gemstone is commonly treated with heat to enhance color?
• Emerald
• Sapphire
• Opal
• Spinel

Rationale: Sapphires are often heat-treated to improve clarity and

deepen color.

• What is the primary purpose of rhodium plating on white gold?
• To make it stronger
• To enhance whiteness and luster
• To increase weight
• To prevent melting 2 / 4

Rationale: Rhodium plating improves the whiteness and shine of

white gold, giving it a bright, reflective surface.

• Which of the following is a step in preparing a bezel setting?
• Drilling a hole through the gem
• Soldering prongs
• Forming a metal collar around the stone
• Using epoxy adhesive

Rationale: A bezel setting secures the stone with a metal rim or collar

that surrounds its perimeter.

7. The color grading of diamonds is based on:

• Hue and tone only
• Comparison to master stones under controlled lighting
• Microscopic inclusions only
• Density measurement

Rationale: Diamond color is graded by visually comparing it to

master stones under standardized lighting and background conditions.

• What tool is used to measure the diameter of a gemstone?
• Loupe
• Caliper
• Microscope
• Spectroscope 3 / 4

Rationale: Calipers accurately measure the physical dimensions of

gemstones for setting and grading.

• What is the term for soldering precious metal parts together using a

torch?

• Annealing
• Forging
• Brazing
• Tempering

Rationale: Brazing, or soldering, uses heat and filler metal to join

jewelry components securely.

• What gas is commonly used with oxygen for jewelry torch work?
• Propane
• Methane
• Acetylene
• Hydrogen

Rationale: Acetylene mixed with oxygen provides a hot, controllable

flame suitable for jewelry soldering.

• What is the main reason for using a polishing compound?
• To remove oxidation
• To achieve a mirror-like surface finish
• To create texture
• To apply plating
• / 4