The 40 alloy for 18-22 kt gold is a bright, intense yellow-green alloy designed to provide high performance in both plastic working and investment casting without stones.

Compared to the 45 alloy, it stands out for its more vibrant and marked tone, capable of emerging more prominently in aesthetic applications. This characteristic makes it particularly suitable for productions that involve the combination with red gold and white gold, creating more pronounced chromatic contrasts and further enhancing the design of the piece.

From a technical standpoint, the alloy offers excellent workability in laminating, drawing, and stamping operations, maintaining a good balance between ductility and strength. In investment casting, it guarantees good fluidity and precise reproduction of details, with uniform and high-quality surfaces.

The homogeneous structure and dimensional stability facilitate subsequent processing and finishing, such as polishing and surface treatments.

The 40 alloy is therefore an ideal solution for high-end jewelry and accessories, where strong chromatic identity, production versatility, and distinctive aesthetic performance are required.