One of the things I love most about antique jewelry is that there's always more to learn. The terminology isn't just collector jargon - it's the language that reveals a jewel's story. A term like collet, foiled-back, or calibré-cut can reveal how a piece was crafted, help date it to a particular period, and explain many of the characteristics collectors value today. So, whether you’re just beginning to explore vintage jewelry or have been building your collection for years, these are the ten terms every enthusiast should know.
1. Collet Setting
A collet - derived from the French word for "small collar" - is a thin band of metal that wraps around a gemstone, with the edge burnished over the stone to hold it securely in place. During the Georgian era, these settings were almost always closed-backed and lined with hand-cut silver or copper foil.
Jewelry in the 1700s and early 1800s was designed to be worn by candlelight. The foil acted like a tiny mirror, reflecting the warm glow of flickering candles back through the gemstone, making diamonds appear brighter and colored gemstones even more saturated.
Today, closed-back collet settings are one of the easiest ways to identify an authentic Georgian jewel and remain one of the period's most distinctive and beloved design elements.
2. Milgrain
If you've ever noticed a delicate border of tiny metal beads framing a diamond or gemstone, you've spotted milgrain. Derived from the French words meaning "one thousand grains," milgrain is created by rolling a small tool along the edge of the metal, leaving behind hundreds of perfectly uniform beads. It may seem like a small detail, but it completely changes the look of a jewel by softening sharp edges and giving the piece an old-world handcrafted feel.
3.Patina
One of the quickest ways to tell whether an antique jewel has lived a good life is to look at its patina. Patina is the soft, mellow surface that develops on precious metals over decades of gentle wear, handling, and exposure to the elements. Unlike tarnish -which is a surface corrosion that many people are quick to polish away- a beautiful patina enhances a piece. It settles into hand engraving and other intricate details, creating depth, contrast, and warmth that's nearly impossible to recreate.
It's also why antique jewelry should be polished thoughtfully and sparingly. Over-polishing can erase these subtle layers in just a few minutes, leaving a piece looking newer—but often less beautiful. To collectors, a beautiful patina is a record of a jewel that has been loved, worn, and cared for across generations.
4. Hallmarks
One of the first things I do when I pick up an antique jewel is turn it over. Tiny stamps hidden inside a ring shank or on the back of a brooch can reveal an incredible amount of information. Known as hallmarks, they tell you a piece's metal purity, where it was made, and, in the case of British jewelry, even the exact year it was hallmarked. They're also one of the best tools collectors have for helping authenticate and date a piece.
One point that's often confused: hallmarks and signatures aren't the same thing. A hallmark is an official stamp that tells you about a jewel's metal purity, origin, or date, while a signature identifies the jeweler or jewelry house that created it. A maker's mark from a renowned jewelry house - such as Cartier, Tiffany & Co., or Van Cleef & Arpels - is considered a signature, making the piece "signed jewelry." That said, don't overlook an unsigned piece! Throughout history, many exceptionally talented jewelers worked anonymously for larger houses or independent workshops, producing extraordinary craftsmanship without ever adding their name to the jewel.
5. Old Mine Cut
If you've ever looked at an antique diamond and wondered why it sparkles so differently, there's a good chance you were looking at an old mine cut. Before modern cutting technology, diamonds were fashioned entirely by hand, with cutters working around the natural shape of each rough crystal rather than following standardized proportions. The result is a softer, pillowy silhouette and broad, chunky flashes of light that feel completely different from the splintery sparkle of a modern brilliant cut.
One of the easiest ways to spot an old mine cut is by looking through the center of the diamond. Instead of coming to a sharp point underneath, you'll see a small flat facet called the culet. Early diamond cutters intentionally left the culet open to protect the delicate tip of the stone during everyday wear, and today it's one of the most recognizable hallmarks of an antique diamond.
6. Paste
One of the biggest misconceptions in antique jewelry is that paste was the "cheap" version of diamonds. In reality, it was a luxury material in its own right!
Developed in eighteenth-century Europe, paste is a high-lead glass that was hand-cut and often backed with foil to imitate diamonds and other precious gemstones. The finest examples were remarkably convincing, and because every stone was faceted and set by hand, paste jewels required many of the same skills as fine gemstone jewelry.
7. En Tremblant
En tremblant is one of my favorite antique jewelry techniques because it does exactly what its name promises. French for "to tremble," it describes flowers, leaves, feathers, and other decorative elements mounted on tiny springs so they move with the wearer.
It's an incredibly clever bit of engineering. Even the slightest turn of the head or movement of the hand sends the jewel into a shimmer. In the days before electricity, that movement caught the flicker of candlelight, making the stones appear alive.
One word of caution: always handle an en tremblant piece by its frame. Those tiny springs are original to the jewel and one of the reasons these pieces are so remarkable today.
8. Demi-Parure
A parure was the ultimate jewelry wardrobe: a matching suite that could include a necklace, earrings, bracelets, brooches, and sometimes even a tiara, all designed to be worn together.
A demi-parure is the smaller version, usually made up of two or three coordinating pieces. While they were once incredibly common, finding one intact today is anything but. Over the last two centuries, countless suites were separated as fashions changed, pieces were inherited by different family members, or individual jewels were sold off. That's what makes an original demi-parure, especially one still housed in its fitted case, such an exciting discovery for collectors.
9. Cannetille
If you've ever wondered how a Georgian gold jewel can look so intricate yet weigh so little, the answer is often cannetille.
Using incredibly fine gold wire, jewelers twisted, coiled, and curled the metal into tiny scrolls, rosettes, and tendrils, creating jewels that appear almost like delicate gold lace. Cannetille is often mistaken for filigree, but they're not quite the same thing. Filigree is an ancient technique that's been used around the world for thousands of years. Cannetille, on the other hand, was a distinctly Georgian fashion born out of necessity. After the Napoleonic Wars, gold was scarce and expensive, so jewelers found ingenious ways to create dramatic, richly textured jewels while using surprisingly little metal.
What began as a practical solution became one of the most recognizable and beautiful styles in antique jewelry.
10. Marriage
This may be the most important term in the entire list because it can have a significant impact on both value and price!
A marriage is a piece of jewelry assembled from components that didn't originally belong together. That might mean a Victorian brooch converted into a pendant, an Art Deco clip transformed into a ring by adding a later band, or the elements of an antique necklace reimagined as a bracelet.
A marriage isn't inherently a bad thing. In fact, many are beautifully executed and allow antique components to be worn and enjoyed in a new way. The key is transparency - a marriage piece should always be disclosed as such and priced differently than an entirely original jewel.
Understanding these ten terms does more than help you identify a piece. It sharpens your eye, deepens your appreciation, and makes the search itself infinitely more rewarding. Consider it your invitation to look a little closer and enjoy the hunt!