Re-weighing in front of you and laser codes: two safeguards

Jewellery is small and so are discrepancies, but with gold even 0.1 g is money. Kim Bảo Minh Châu uses two safeguards so you can verify the piece you receive.

Safeguard one: re-weighing in front of you

• Trading scales carry a valid verification certificate, read to 0.001 g and are self-checked weekly.
• Before handover, staff place the piece on the scale with the display facing you.
• Actual weight is never below the tagged weight. More than 0.005 g off the record and the piece is withdrawn for checking; you choose another or wait.

Measurement rules for gold trading (Circular 22/2013/TT-BKHCN) require gold weight at sale to be no less than stated. KBMC sets a tighter internal tolerance and weighs in front of you.

Safeguard two: the laser code

Each piece carries a unique identifier, laser-engraved inside the band or on the clasp. The same code is printed on the tag, invoice and warranty card. It leads to the original record:

• Purity test by X-ray fluorescence at the workshop
• Weight on leaving the workshop
• Stone grading report
• Every service visit with weight before and after

Benefits for service and resale

1. No mix-ups. Staff match the code at intake and at return, so you get your own piece back.
2. No original papers needed. On buy-back KBMC finds the record by code; a lost paper invoice does not stop you selling by formula.
3. Wear tracking. Polishing removes a tiny amount of metal; the record logs weight after each service.

More on Certification and origin.