There are some disadvantages of dot peen engraving for necklaces：

l Mark Depth: The depth of the mark is limited, which can make it difficult to read on some materials, especially those with a darker or textured surface.

l Surface Finish: The surface of the necklace must be smooth and free of defects for the best results. Rough or uneven surfaces can affect the clarity and readability of the engraving.

l Noise: The process can be noisy, as it involves a mechanical impact on the metal. This may not be ideal for some people, especially those who are sensitive to noise.

l Potential for Damage: While the risk is minimal, there is a slight chance of damaging the necklace's surface, particularly if the engraving is too deep or if the machine is not calibrated correctly.

l Limited Design Complexity: While dot peen engraving can create intricate designs, it may not be suitable for highly detailed or complex patterns. Simpler designs often produce the best results.