CBJ Skills and Expertise 5

Question 1

When drilling a hole in a gemstone for a bead-drilled pendant, which drill type is most appropriate?

Accepted Answer

A diamond-coated drill bit used with water lubrication at low speed

Answer

Diamond-coated drill bits with water lubrication at low speed reduce friction and heat, preventing cracking of the gemstone during drilling.

Question 2

What does the term 'sweat soldering' describe in bench fabrication?

Accepted Answer

Pre-applying solder to one surface, then reheating to fuse two parts together without adding more solder

Answer

Sweat soldering involves tinning one surface with solder first, then reheating the assembly to fuse it together without adding additional solder to the joint.

Question 3

When engraving a bright-cut design on a ring shank, which graver shape produces the characteristic reflective V-groove?

Accepted Answer

A V-point (onglette) graver

Answer

The V-point (onglette) graver cuts a sharp V-groove that reflects light from its polished walls, producing the bright-cut effect.

Question 4

A jeweler needs to anneal a work-hardened piece of sterling silver. What is the correct procedure?

Accepted Answer

Heat to a dull red glow, then quench in pickle or water to soften

Answer

Heating sterling silver to a dull red (approximately 1100°F/593°C) and then quenching relieves work hardening and restores malleability.

Question 5

What is the primary role of investment compound in the lost-wax casting process?

Accepted Answer

Creating a mold by encasing the wax model and withstanding casting temperatures

Answer

Investment compound is a refractory plaster-like material that encases the wax model, survives burnout and casting temperatures, and forms the mold cavity.

(CBJ) Certified Bench Jeweler Practice Test

(CBJ) Certified Bench Jeweler Practice Test

CBJ Skills and Expertise 5