Which clasp should this piece use?

Buyers specify the chain and the pendant, then accept whatever clasp the factory quotes. That is reasonable for a necklace and a mistake for a bracelet, where the clasp takes load every time the piece is put on.

Lobster clasp

A spring-loaded gate on a hook. It is the default on mid- and heavy-weight chains for good reason: strong, self-closing, and it does not open under tension.

• Use on: bracelets, men's chains, anklets, anything above 2 mm.
• Cost: the most expensive of the four, and still a few cents.
• Failure mode: the spring weakens after years of use, not months.

Spring ring

A hollow ring with a sliding pin. It is the lightest and cheapest, and it is standard on fine necklaces where the piece carries no load.

• Use on: necklaces under 2 mm, delicate pendants.
• Do not use on: bracelets. A bracelet is pulled, tugged and caught; a spring ring will open.
• Note: the small lever is difficult for customers with limited dexterity.

Toggle clasp

A ring and a bar. Decorative, adjustable, and easy to operate one-handed.

• Use on: fashion pieces where the clasp is part of the look.
• Limitation: it opens when the chain goes slack, so a loose toggle on a wrist is a lost bracelet.
• Best in: a snug fit, or with a weighted bar.

Magnetic clasp

Two magnets, often disguised as a barrel.

• Use on: accessibility-led ranges, and pieces where the wearer has trouble with small findings.
• Do not use on: high-value items, active wear, or anything for children.
• Reality: a firm knock releases it. This is a feature for the wearer and a risk for the seller.

How to choose

Two details worth specifying

Jump ring soldering. An unsoldered jump ring is the second most common failure after a weak clasp. On bracelets, specify soldered or welded rings; the cost difference is negligible and the return rate changes.

Clasp finish. A bright steel clasp on a black PVD chain looks like a replacement part. Specify the clasp in the same finish as the chain; it is one line on the drawing and it is why some ranges look considered and others look assembled.

Both points belong in the technical drawing, not in a conversation after the sample arrives.