CBJ test — what's the hardest skill area and how do people prep for it?
I'm a bench jeweler with 6 years on the floor and my shop owner is pushing me to get the CBJ certification. I set stones, do basic sizing, and repair prongs all day but I've never had formal training so I'm nervous about the theory portions.
I'm decent with hand tools but I hear the casting and alloying theory is where people get tripped up. I also don't have much experience with engraving, which I think shows up on the practical component.
How do people approach this when their shop work only covers a subset of the full competency list?
Casting theory was definitely my weak spot too. Invest time in understanding sprue placement, shrinkage rates, and investment mixing ratios — the written sections go deep on this even if your shop doesn't cast in-house.
Engraving is on the practical but it's not weighted heavily. You can learn enough to pass with a few weeks of deliberate practice on scrap metal. Don't let it stress you out disproportionately.
The alloy chemistry section caught me off guard. Know your karat math cold, understand how copper and silver affect color and hardness in yellow and white gold, and memorize melting ranges for common alloys.
I used the CBJ practice questions here alongside the Jewelers of America study materials. The practice questions are good for identifying gaps — I failed the first mock badly then drilled weak areas and passed the real thing comfortably.