Baltic amber has three common imposters, and they're not equally dishonest. Plastic is an outright fake. Glass is obvious once you handle it. But copal is genuine fossilised tree resin — just millions of years too young — and it passes several of the tests people rely on. Most amber misidentification comes down to copal, not plastic.
Here's how to separate all three, in the order we test.
What Baltic amber actually is
Baltic amber, or succinite, is fossilised resin from ancient conifer forests, roughly 40 million years old. The Baltic region holds the world's largest deposit, and its amber is distinguished by a high succinic acid content.
Copal is the same substance at an earlier stage — resin that has hardened but not fully polymerised, typically thousands to a few million years old. It looks convincing. It simply hasn't finished becoming amber, and over decades it will craze and darken in ways amber won't.
Test 1: Saltwater float
Dissolve about one part salt into two parts warm water until no more dissolves. Drop the piece in. Amber floats or hovers near the surface; glass and most plastics sink.
Useful for eliminating plastic and glass quickly. It does not distinguish amber from copal — copal floats too. Rinse and dry the piece afterwards, and avoid this on strung pieces where salt could sit in the cord or corrode a clasp.
Test 2: Ultraviolet light
Under a UV torch, Baltic amber fluoresces a distinct blue-white or milky tone. Copal glows weakly, often a dull whitish, and most plastics barely respond.
This is where copal starts to separate. It's non-destructive, costs the price of a small torch, and it's the test we'd recommend anyone buying amber regularly should own.
Test 3: Static
Rub the piece vigorously on wool or cotton for around 30 seconds, then hold it near a torn scrap of tissue. Amber builds a static charge strong enough to lift it.
This is the oldest known property of the material — the Greek word for amber, elektron, is where "electricity" comes from. Copal produces some charge, so treat this as supporting evidence rather than proof.
Test 4: Acetone (the copal separator)
Place a drop of acetone on an inconspicuous spot for about a minute, then wipe. Copal softens and becomes tacky, and the surface may cloud. True amber is unaffected.
This is the most decisive amateur test for copal, but it can mark a softer or heavily polished surface, so use it sparingly and never on a carved face or the front of a cabochon.
The test to avoid
The hot needle test appears in most guides. Genuine amber gives a resinous, incense-like scent, copal smells sweeter and softens fast, plastic smells acrid.
It also leaves a permanent burn mark. On a strand of graduated nuggets that damage is irreversible, and UV plus acetone tells you the same thing without harming the piece.
Reading inclusions and bubbles
- Natural imperfection is a good sign. Genuine amber commonly contains bubbles, plant debris and cloudy patches.
- A perfect insect is a warning. Real fossil inclusions are usually partial, awkwardly positioned, or obscured. A large, centred, undamaged specimen in clear resin is far more often a modern embedding.
- Elongated flow lines suggest pressed amber — real amber fragments heated and compressed together. It's genuine material, but it's a reconstituted product and should be priced as one.
Physical tells
Amber is warm to the touch almost immediately, where glass stays cold. It's notably light for its size. And it's soft — around 2 to 2.5 on the Mohs scale — so genuine old pieces show fine surface scratches and softened edges from wear. A large "antique" strand with flawless surfaces deserves scepticism.
Seeing it in practice
Our Baltic Amber pieces show the natural variation the tests above are built around.
Cognac is the classic Baltic tone. The double strand cognac nugget necklace demonstrates how much colour and clarity vary bead to bead within a single genuine strand — uniformity across every bead would be the suspicious result. The 46g single strand shows the same at lighter weight.
For the softness point, the honey cognac cabochon ring carries the fine surface wear that decades of contact produce. The amber chip bracelet is an inexpensive way to handle the material and try the static test yourself.
Before you buy
Ask whether the seller has UV tested the piece and what colour it fluoresced. Ask whether it's natural or pressed. Both are fair questions, and a dealer handling real material will answer without hesitation.
You can read how we assess pieces in Our Sourcing & Assessment Process, or browse Vintage Jewellery. Our companion guides cover identifying genuine Bakelite and genuine Murano glass — both materials where, as with amber, the fakes are convincing until you know what to look for.
This guide is for general identification purposes. For insurance or resale valuation, consult a qualified appraiser.