CBJ Practice and Application 3

Question 1

A platinum prong has cracked and needs to be re-tipped. Which solder type should be used?

Accepted Answer

Platinum solder matched to the alloy

Answer

Platinum requires platinum solder matched to the specific alloy to maintain color, strength, and melting point compatibility.

Question 2

When polishing a high-karat gold piece on a buffing wheel, the jeweler should:

Accepted Answer

Keep the piece moving and hold it below center of the wheel

Answer

Moving the piece constantly and keeping it below wheel center prevents the wheel from catching the piece and throwing it.

Question 3

A customer requests engraving on the inside of a tungsten carbide ring. The jeweler should:

Accepted Answer

Advise the customer that tungsten carbide cannot be engraved with standard jewelry equipment

Answer

Tungsten carbide is extremely hard and brittle, making it incompatible with traditional engraving tools used in jewelry.

Question 4

When sizing a white gold ring up two sizes, the jeweler notices the solder joint turned yellow after soldering. This most likely means:

Accepted Answer

Gold solder with too low a karat or wrong color was used

Answer

Yellow discoloration at a white gold solder joint indicates a mismatched solder — yellow gold solder used instead of white gold solder.

Question 5

The purpose of annealing a piece of metal work-hardened during fabrication is to:

Accepted Answer

Restore ductility and workability by relieving internal stress

Answer

Annealing heats metal to relieve stress and recrystallize the grain structure, restoring malleability lost through work-hardening.

(CBJ) Certified Bench Jeweler Practice Test