Examination Questions And Correct

Certified Bench Jeweler (CBJ) Practice Examination Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

Comprehensive Practice Exam – Jewelers of America Certification Program

Covers: Jewelry Repair, Stone Setting, Metal Work, Polishing, Casting,

Soldering, Design, and Safety

• What is the most appropriate saw blade size for cutting 20-gauge

sheet metal?

• 1/0
• 2/0
• 4/0
• 3

Rationale: A 2/0 blade provides good control and cutting ability for 20-

gauge sheet metal without breaking easily.

• / 4

• When annealing silver, what visual cue indicates the proper

temperature has been reached?

• The metal turns black
• The metal shows a dull red glow
• The metal becomes shiny
• The metal begins to melt

Rationale: A dull red glow indicates silver is at annealing temperature,

restoring ductility without melting.

• Which torch flame is best for soldering sterling silver?
• Oxidizing
• Neutral
• Reducing
• Carburizing

Rationale: A neutral flame balances oxygen and fuel, preventing oxidation

and contamination of the solder joint.

• What is the purpose of using flux during soldering?
• To prevent oxidation and promote solder flow
• To polish the metal surface
• To create a stronger solder
• To speed up cooling 2 / 4

Rationale: Flux prevents oxidation and allows solder to flow smoothly across

metal surfaces.

• Which of the following karat golds is the hardest?
• 18K yellow gold
• 14K white gold
• 10K yellow gold
• 22K yellow gold

Rationale: Lower karat golds like 10K contain more alloy metals, increasing

hardness.

• What is the first step in resizing a gold ring smaller?
• Polish the ring
• Solder the cut
• Cut out a small section of the shank
• Add sizing stock

Rationale: To make a ring smaller, a section is removed before rejoining and

soldering.

• Which type of file is best for refining prongs during setting?
• Flat file
• Needle file 3 / 4

• Half-round file
• Barrette file

Rationale: Needle files allow for precise shaping in small, detailed areas like

prongs.

• What is the Mohs hardness of corundum (sapphire/ruby)?
• 8
• 9
• 7
• 10

Rationale: Corundum ranks 9 on the Mohs scale, second only to diamond.

• Which polishing compound is best for final high polish on platinum?
• Tripoli
• Rouge
• White diamond
• Emery

Rationale: White diamond compound gives a bright finish suitable for hard

metals like platinum.

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