Is Unmarked Jewelry Worthless?

No, and this is one of the most common worries people bring through my door. A missing hallmark means the piece needs testing, not that it's junk. Plenty of genuinely old gold was never marked at all, and marks wear off rings routinely. Unmarked simply means unproven, and proving it takes a jeweler about two minutes.

First, karat and carat are not the same word

Worth clearing up, because it causes real confusion when people are trying to work out what they own.

Karat measures gold purity, out of 24. So 24k is pure gold, 18k is 75% gold, 14k is 58.3% and 10k is 41.7%. Carat measures a gemstone's weight, where one carat is 0.2 grams. A ring can be 14 karat gold set with a one carat diamond, and the two numbers have nothing to do with each other.

Why would a real piece of gold have no mark?

Three reasons, and none of them means the piece is fake.

It's old. Hallmarking practice varied enormously by country and era, and a great deal of American gold jewelry was simply never stamped. If you know the piece has been in the family for a few generations, that on its own probably explains it.

It was made one-off. A commissioned piece from a bench jeweler often carries no maker's mark or purity stamp at all, because there was no production line and nobody to satisfy but the customer.

The mark wore away. This is the big one for rings. The stamp usually sits inside the shank, exactly where the ring rubs against the adjacent finger every day for decades. On a well-worn old band the mark can be completely gone, and sizing work can remove it too, since resizing cuts out a section of the shank.

The reverse is worth saying just as plainly: a mark is not proof either. Stamps are easy to fake, and plated items get stamped to deceive. A mark is a claim. A test is evidence.

How does a jeweler test an unmarked piece?

Several ways, from least to most informative, and any decent buyer will do this in front of you.

• Magnet. Crude but instant. Gold, silver and platinum aren't magnetic, so a pull tells you there's a base metal core or clasp.
• Acid testing. A tiny scratch on a test stone, then graded acids to see what dissolves. Cheap, reliable and very slightly destructive.
• Electronic testers. Read conductivity to estimate purity, with no visible mark left on the piece.
• XRF analysis. An x-ray fluorescence gun reads the actual elemental composition without touching the piece. It's the most accurate and it's what settles arguments about plating and unusual alloys.
• Specific gravity. Weight against water displacement, useful for solid pieces where surface tests could be misled by plating.

If someone offers you a price on an unmarked piece without testing it in front of you, that's your cue to go somewhere else.

So what is an unmarked piece actually worth?

At minimum, the metal it contains, and that floor is a lot higher than it used to be given where gold has gone.

Above that floor, the same things matter as with any other piece: the stones, the workmanship, the age, whether anyone wants the design. Absence of a hallmark can knock something off the value of an older piece where documentation and attribution drive the price, since a maker's mark is part of proving what it is. For most ordinary jewelry it changes very little once the metal has been identified.

If you've got unmarked pieces and you suspect there's something to them, bring them in. We'll test them in front of you, tell you the metal and the day's market rate, and give you a fair price if you decide to sell. If you'd rather keep them, you'll at least walk out knowing what you own. Drop by our La Jolla showroom.