Jewelry Clasp Types and Dates: Date a Necklace or Brooch by Its Clasp
C clasp, trombone, safety catch, spring ring, lobster, box clasp: when each was used, and how to date vintage necklaces, brooches and earrings by their findings.
· Jewelry Identifier
The clasp is often the best date clue on an unmarked piece. Stones get replaced and metal gets repolished, but the catch on the back of a brooch or the fastening on a necklace follows the hardware of its time. Know the main types and you can say “not before about 1910” or “probably Victorian” in a few seconds.
One caution before the tables: clasps break and get replaced. A clasp gives you the earliest date the piece in its current form could have, and it should agree with the rest of the construction. A Victorian-looking locket on a lobster clasp is either a modern piece or an old one with a new clasp; the chain and the locket’s own hinge decide which.
Brooch clasp types
| Clasp | How to recognise it | Typical dates |
|---|---|---|
| C clasp | A simple open C-shaped hook, no locking part. The pin stem often extends past the edge of the brooch | Before about 1900; common on Georgian and Victorian brooches |
| Tube hinge | The pin stem pivots in a short tube soldered to the back | Mostly 19th century |
| Trombone clasp | A tube catch you pull out and twist to lock, like a trombone slide | About 1890 to 1930s, mainly European |
| Safety catch (rotating) | A C clasp with a small lever or rotating sleeve that closes the opening | From the 1910s, standard from the 1920s and 1930s on |
| Roll-over or locking catch | The modern catch with a rotating half-cylinder | Mid-20th century to today |
A long pin stem that overhangs the frame, together with a C clasp, is the classic sign of a 19th-century brooch. A safety catch on an otherwise Victorian-looking brooch usually means either a later replacement or a 20th-century revival piece.
Necklace and bracelet clasp types
| Clasp | How to recognise it | Typical dates |
|---|---|---|
| Hook and eye, S-hook | A plain hook through a loop or ring | Ancient to Victorian; still used on handmade pieces |
| Box clasp (tongue and box) | A folded metal tongue that clicks into a box, often with a decorated face | Victorian on; figure-eight safety catches on the side mostly later 20th century |
| Barrel or screw clasp | Two halves that screw together | Common in the 20th century, especially on beads and pearls |
| Spring ring | A round ring with a tiny lever that pulls back a spring-loaded arc | 20th century to today, on fine and costume chains alike |
| Lobster clasp | A claw-shaped hook with a spring lever | Standard on mass-produced chains since the second half of the 20th century |
| Toggle | A bar that passes through a ring | Old in origin, very common again from the 1980s on |
| Magnetic clasp | Two halves held by a magnet | Late 20th century to today |
Earring findings and dates
| Finding | How to recognise it | Typical dates |
|---|---|---|
| Shepherd hook, French wire | A wire through a pierced ear | Every period; very old ones are thicker and hand-bent |
| Screw back | A small screw presses a pad against the lobe, for unpierced ears | About 1890s to 1950s |
| Clip-on | A hinged spring clip, for unpierced ears | From the 1930s; very common 1940s to 1960s |
| Post with butterfly back | A straight post through the ear held by a friction back | Mainly from the mid-20th century on |
| Lever back | A hinged wire loop that clicks shut behind the ear | 20th century to today |
How to use the clasp with the rest of the piece
A date range from the clasp only means something next to the other evidence. Check that it agrees with:
- Marks. A hallmark with a date letter beats everything else. See how to read jewelry hallmarks and the jewelry stamps table.
- Construction. Hand-pierced work, closed-back settings and foil-backed stones point earlier than cast mountings with open galleries. More on that in how to identify vintage jewelry.
- Stones and cuts. Rose cuts and old mine cuts are older than modern brilliants.
- Wear. A clasp that looks crisp and new on a piece worn smooth everywhere else is probably a replacement.
Dating a piece from a photo
If you have the piece in front of you, take two photos: the front, and the back with the clasp or catch in focus. Upload either to our jewelry identifier and the report names the clasp and findings it can see, reads any marks, and gives a likely age range with the features for and against it. It also names what would contradict that range, such as a clasp newer than the rest of the piece.