Reconstructed Amber
Reconstructed Amber
Pressed amber fused from natural fragments under heat and pressure
Reconstructed amber, also called pressed amber or ambroid, is a material produced by heating small fragments of natural amber under pressure until they fuse into larger workable pieces. The technique allows the working of stock that would otherwise be too small for the cutting and carving trades. Because the starting material is genuine fossil resin, reconstructed amber occupies an intermediate position between natural amber and outright imitation: it is not synthetic, but it has been structurally altered. Disclosure as reconstructed, pressed, or ambroid is required under FTC, CIBJO, and AGTA guidelines, and recognised laboratories report it separately from natural single-piece amber.
Manufacture
The process was patented in the late nineteenth century — Spiller's 1881 patent describes the principal technique — and refined for industrial use in the early twentieth, principally for the cutting trades around the Baltic and the Dominican Republic. Small chips and fragments of natural succinite (Baltic amber) or other genuine amber species are softened at temperatures around 200 to 250 degrees Celsius and consolidated under pressure of several hundred bar. The amber softens enough for the fragments to flow together at their boundaries without complete melting; the boundary regions develop a partial fusion that holds the mass together while preserving most of the original physical character of the source material.
The cooled product is a single coherent mass that can be sliced, drilled, faceted, and carved like solid natural amber. Modern reconstruction processes can produce material that approaches natural amber in clarity, hardness, and lustre. Lower-grade reconstruction, by contrast, is visibly cloudy and shows clear flow lines and elongated air bubbles where fragments did not fully consolidate. The 20th-century industrial use was extensive enough that significant volumes of reconstructed amber circulate in the antique market alongside natural single-piece amber, sometimes without clear disclosure.
Identification
Reconstructed amber is distinguished from natural single-piece amber under magnification by several diagnostic features. The most reliable is the presence of sun spangles — flat, disc-like fractures formed by the rapid cooling of trapped gas — which occur in unusually high concentrations and characteristic patterns in pressed material. Elongated, parallel gas bubbles that follow the direction of pressing are also diagnostic, in contrast with the rounded, randomly distributed bubbles of natural amber. Flow lines visible in transmitted light reveal the boundaries between fused fragments, and these flow lines are often most apparent under polarised light or against a strongly lit background.
Spectroscopy in the infrared region confirms the material is genuine succinite or related fossil resin and distinguishes reconstructed amber from younger copal and from synthetic resins such as Bakelite, polystyrene, and modern epoxies that are sometimes sold as imitation amber. Specific gravity remains close to that of natural amber, around 1.05 to 1.10, since no foreign binder is added. Long-wave ultraviolet fluorescence is similar to that of natural amber — often a distinctive milky blue or yellow — which is why ultraviolet response alone cannot resolve the question of reconstruction.
The salt-water flotation test (amber floats in saturated saline) does not distinguish reconstructed from natural amber, since both are genuine fossil resin. The test does distinguish amber and reconstructed amber from most plastic imitations, which sink in saline; this is a quick but partial diagnostic.
Position in the market
Reconstructed amber commands a fraction of the price of natural single-piece amber of equivalent size, colour, and clarity. The discount widens for larger pieces, where natural rough is rare and reconstruction is the only economical way to produce big workable stock. The material is used widely in costume jewellery, smoking accessories, beads, and machine-carved figurines, and in religious and ethnographic objects from Baltic and Asian production centres. Significant volumes of reconstructed amber circulate in the antique markets of Eastern Europe and the Middle East, particularly in beads, prayer-bead strands, and figurines.
For finer markets — investment-grade insect inclusions, museum pieces, and high-end jewellery — only natural single-piece amber is appropriate, with insect inclusions and provenance verified by laboratory examination. Reconstructed amber with insect inclusions is occasionally encountered, but inclusions in reconstructed material are typically introduced after pressing or are themselves rearranged by the process. A genuinely fossiliferous insect in pressed amber is essentially never encountered.
Care
Reconstructed amber should be cared for as natural amber with slightly greater caution. The material is soft (Mohs 2 to 2.5), heat-sensitive, and vulnerable to organic solvents including perfume, hairspray, acetone, and strong cleaners. The fused boundaries can be lines of weakness under impact, and reconstructed amber is more prone to cracking along these boundaries when subjected to thermal shock or mechanical stress. Ultrasonic and steam cleaning are not recommended. Clean with a soft cloth and lukewarm soapy water, dry promptly, and store separately from harder stones to avoid abrasion. Polished reconstructed amber dulls more rapidly than fine natural amber under normal wear.