The three seconds in which the customer decides to buy — the counter has already done its job by then. But from the moment the goods leave your hand, the box starts doing the display for you. Every box you hand out is a “mobile window display” the customer takes home.

Match the lining to the goods first. White diamonds and platinum read brighter on dark velvet linings — the navy gold-edge jewelry box ZBH13 with its deep blue velvet base brings out the fire of diamonds the moment they're placed; for warm goods like gold and rubies, pair the gold-edge red-pattern box ZBH12, whose red and gold edges share the goods' warm tone — festive and refined at once.

Match style to the customer. Young, light-luxury lines suit clean rounded corners — the multicolor round velvet box with crown clasp ZBH14 has a distinctive clasp that still looks generous when the customer pulls it out on the street; Chinese-style or vintage goods fit the octagonal velvet jewelry box ZBH11, whose octagonal silhouette is special and matches the brand's tone.

Don't skip the details either. The insert slots should hold the goods snugly — a ring slot at just the right depth so the piece stands upright the first moment the customer opens the box, not leaning over; hot-stamped logos centered on the lid, naturally visible in photos, and each one is a free word-of-mouth post.

I burned myself on this. For a while I treated boxes as consumables and bought the cheapest generic ones. A customer who'd bought a 5,000-yuan pendant came back saying, “The box can't carry that price.” After we leveled the packaging to the price point, returns stayed the same, but the reviews mentioning “even the packaging is thoughtful” clearly increased.

Matching boxes to product lines costs a few extra yuan per order — and buys lasting goodwill after the customer leaves. Packaging isn't the end of service; it's the last centimeter of it.