Pancyprian TS Jewellery III common mistakes
Pancyprian TS Jewellery III · Understand the traps and how to avoid them.
When annealing silver or gold, the candidate heats the metal until it glows bright red and then quenches it immediately in water, without observing the correct annealing temperature or cooling method for the alloy.
The candidate confuses the annealing temperature of steel with that of precious metals, or believes that 'red hot' is always required. In reality, silver anneals at about 650°C (dull red in low light), and gold alloys at 600–700°C; overheating causes grain growth and, for some alloys, surface oxidation or firestain. Quenching is correct for silver and most gold alloys, but not for all (e.g., some white golds may crack if quenched).
What to do instead
Learn the annealing colour and temperature range for each alloy used in the workshop: silver to dull red, gold alloys to a faint red; use a heat-treating chart or temperature-indicating crayon. Heat evenly, remove the flame as soon as the colour is reached, and quench silver and most gold alloys in water; for white gold, allow air cooling or follow the alloy supplier's recommendation. Practice on scrap pieces and observe the colour under normal lighting.
When soldering a joint, the candidate applies the solder to the joint before the workpiece has reached the soldering temperature, or uses a flame that is too large and directed at the solder rather than the workpiece.
The candidate is impatient or believes the solder will 'flow' as soon as it touches the metal. Solder melts at a lower temperature than the workpiece; if the workpiece is not hot enough, the solder balls up and does not flow into the joint. A large flame or direct heating of the solder causes the solder to melt prematurely and oxidise, leading to a weak, lumpy joint.
What to do instead
Heat the workpiece, not the solder. Bring the joint to the soldering temperature (the flux becomes clear and the metal just begins to shimmer), then touch the solder to the joint; it should flow instantly. Use the smallest flame that will do the job, adjust to a neutral flame, and keep the torch moving. Practice on scrap with the same solder and flux to learn the visual cues.
When sawing metal, the candidate pushes the saw with excessive force and uses a blade with too many teeth per inch for the thickness of the metal, resulting in broken blades and crooked cuts.
The candidate believes that more force speeds up the cut, and selects a blade without considering the rule that at least two teeth should be in contact with the metal thickness at all times. Too fine a blade clogs and breaks; too much force causes the blade to buckle. Lack of practice in controlling the saw stroke also contributes.
What to do instead
Select the blade according to metal thickness: for thin sheet (under 1 mm), use a 6/0 or 8/0 blade; for thicker sections, use a coarser blade (e.g., 2/0 or 1). Apply light, even pressure and let the teeth do the work; use a saw frame with the blade tensioned properly and cut with long, steady strokes. Practice on scrap brass or copper to develop rhythm and control.
When filing a piece to shape, the candidate files only in one direction and does not support the work properly, producing rounded edges, deep scratches, and an uneven surface.
The candidate treats filing as a simple rubbing action and does not understand that a file cuts only on the forward stroke and that the workpiece must be held securely. Filing in one direction creates deep grooves; lack of support causes vibration and chatter. Using a worn or clogged file also leads to poor results.
What to do instead
Clamp the workpiece securely at a comfortable height, use a file card to keep the file clean, and file with a steady forward stroke, lifting the file on the return. For flat surfaces, use a cross-hatch or draw-filing technique; for curved surfaces, use a half-round or needle file with a rocking motion. Check progress frequently with a square or template. Practice on scrap to develop control.
When measuring with a vernier caliper or micrometer, the candidate reads the scale incorrectly, ignores the zero error, or applies excessive pressure to the jaws, leading to inaccurate dimensions.
The candidate is unfamiliar with the vernier scale or the micrometer thimble, or rushes the measurement. Zero error (when the jaws are closed and the reading is not zero) is not checked. Over-tightening the micrometer or caliper jaws compresses the workpiece or the instrument, giving a false reading.
What to do instead
Before measuring, close the jaws and check for zero error; record it and apply the correction. For vernier calipers, read the main scale and then find the vernier line that aligns exactly; for micrometers, read the barrel and thimble and use the ratchet stop to apply consistent pressure. Measure at least twice and take the average. Practice with gauge blocks or known samples.
When setting a stone in a bezel or prong setting, the candidate uses excessive force and does not check the stone's girdle or the seat, causing chipped stones or loose settings.
The candidate is anxious to finish and believes that tighter is better. Stones, especially emerald, opal, and pearl, are brittle and can chip if the bezel is pushed too hard or if the seat is not properly cut. Prongs may be bent unevenly, leaving the stone loose or tilted. Lack of familiarity with the stone's hardness and cleavage also contributes.
What to do instead
Cut the seat to the exact depth and shape of the stone's girdle; use a setting bur or hart bur of the correct size. When pushing a bezel, use a bezel roller or pusher with controlled pressure, working gradually around the stone, and check frequently that the stone is level and secure. For prongs, bend them gradually and check with a probe that the stone does not move. Always test on a practice stone of the same type before working on the final piece.
When using a jeweller's saw or drill, the candidate fails to secure the workpiece or uses the equipment without proper eye protection and dust extraction, leading to accidents or inhalation of fine metal dust.
The candidate underestimates the risks of small-scale workshop tools and is focused on the task. Workpieces held by hand can slip and cause cuts; drilling without safety glasses can send metal chips into the eye; filing and polishing precious metals produce fine dust that is toxic (e.g., cadmium, beryllium in some alloys) and should be captured. Lack of familiarity with workshop safety rules also plays a role.
What to do instead
Always clamp the workpiece in a vice or use a ring clamp; wear safety glasses when drilling, sawing, or polishing; tie back long hair and remove loose clothing. Use a dust extraction system or wet methods when filing or polishing, and wear a dust mask if ventilation is poor. Keep the bench clean and store tools safely. Review the workshop safety checklist before starting any task.
When making a ring or a chain, the candidate does not allow for metal thickness or joint clearance, resulting in a ring that is too small or a joint that does not close properly.
The candidate calculates the length of the ring blank using the inner circumference only, forgetting that the metal thickness adds to the outer diameter and that bending changes the effective length. For chains, links are made without considering the thickness of the wire and the necessary overlap for soldering. Lack of experience with the material's behaviour during forming also contributes.
What to do instead
For a ring, calculate the blank length as the inner circumference plus the metal thickness (or use a ring size chart that accounts for thickness). For chains, make links with a mandrel of the correct size and allow at least one wire diameter of overlap for soldering. Always make a test piece in base metal to check fit before working in precious metal. Measure the final piece with a ring gauge or caliper.
When finishing a piece, the candidate polishes with a compound that is too coarse or uses a buff that is contaminated with coarse grit, leaving scratches and a dull surface instead of a mirror finish.
The candidate wants to save time and skips the intermediate polishing steps, or uses a dirty buff. Polishing compounds are graded; using a coarse compound after a fine one reintroduces scratches. Contamination from previous jobs on the buff can also cause scratches. Lack of understanding of the sequence of abrasive grits is the root cause.
What to do instead
Follow a proper sequence: file, then emery paper or abrasive wheels of increasing fineness (e.g., 400, 800, 1200 grit), then polish with a suitable compound (e.g., tripoli for cutting, rouge for colouring). Use separate buffs for each compound and keep them clean and covered when not in use. Clean the piece between stages. Practice on scrap to see the effect of each stage.
When repairing a piece, the candidate does not assess the original construction or the presence of stones, and applies heat or force that damages the piece or loosens stones.
The candidate is focused on the repair and overlooks the need for a thorough inspection. Stones may be heat-sensitive (e.g., opal, emerald, tanzanite) and can crack or discolour if heated; some pieces may have glued components or plated finishes that are damaged by heat. Lack of experience in identifying materials and construction methods leads to mistakes.
What to do instead
Before any repair, inspect the piece under magnification, identify all materials and stones, and check for previous repairs. Remove stones if there is any risk from heat, or use heat-shielding techniques (e.g., wet tissue, heat sink). Use the lowest temperature and least force necessary. Test on a hidden area if unsure. Document the repair and inform the customer of any risks.