Designing a box that cannot go wrong
On this page11
The problem is stock, not intent
Nobody sets out to put "sterling" on a plated piece. It happens because one box design was bought in bulk and gets used for everything.
So buy the generic box generic
Your name, your mark, a colour, nothing about metal. A box that makes no fineness claim cannot make a wrong one, whatever ends up inside it.
Put the metal claim on the card instead
Which is also named in the statute, so it carries the same duty, and it is cheap and line-specific. Printing a hundred cards per line costs less than printing a hundred boxes.
And the card can be swapped
A line that changes metal, or a piece that goes out plated instead of solid, needs a different card and the same box. That is the flexibility the box cannot give you once it is printed.
Keep plated and solid stock physically apart
Different shelf, different colour box if you like, but separated. The failure is a hand reaching for the nearest box on a busy day.
Watch what a supplier prints by default
Generic jewelry boxes are sometimes sold pre-printed with metal words because they are meant for a sterling line. Those boxes are a liability sitting in a stockroom.
Remember the wrapper counts too
The list is box, package, cover and wrapper. Tissue, a printed sleeve and an outer mailer are all surfaces the prohibition reaches.
And so does the listing, under a different regime
How you describe a piece in advertising is the FTC Jewelry Guides at 16 CFR part 23, a separate body of rules this property does not summarize. The box and the listing are two different questions.
Decide the claim once, per line
Metal, fineness, qualifier if plated, and who is making the claim. Write it down once and let the card, the stamp and the listing all come from that one decision.
Which is cheaper before the print run
Reprinting a thousand boxes costs more than thinking about it for ten minutes, and it is the same order of saving as every other front-loaded decision in this library.